Yosemite Freezing at the same time on 3 Mac Pros

I've installed Yosemite on 3 Mac Pro's ( variety of models, 2010 and 2011)
They are all regularly freezing up at exactly the same time.
When I say freeze, I mean everything is unresponsive except the cursor still moves. The clock stops for the duration of the freeze, the macs lose their connection to the network ( I can't access them via ARD)
They all burst back into life around 5 minutes later
Sometimes the time between freezes is an hour, some times longer

You can do it with Automator.
http://www.automator.us/examples-01.html
Or with a utilities like these:
http://www.publicspace.net/ABetterFinderRename/
http://renamer4mac.com/
You can also do it using the Terminal command line.
Matt

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    10.199.190.0
    2014/8/5 10:07
    DHCP/BOOTP
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    10.199.190.46
    10.199.190.46
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e343600
    10.199.190.59
    10.199.190.59
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    31302e3139392e3139302e353900
    10.199.190.69
    10.199.190.69
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e363900
    10.199.190.74
    10.199.190.74
    2014/8/5 10:07
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    31302e3139392e3139302e373400
    10.199.190.90
    10.199.190.90
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e393000
    10.199.190.101
    10.199.190.101
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31303100
    10.199.190.104
    10.199.190.104
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31303400
    10.199.190.110
    10.199.190.110
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31313000
    10.199.190.114
    10.199.190.114
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31313400
    10.199.190.117
    10.199.190.117
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31313700
    10.199.190.121
    10.199.190.121
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31323100
    10.199.190.138
    10.199.190.138
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31333800
    10.199.190.144
    10.199.190.144
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31343400
    10.199.190.153
    10.199.190.153
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31353300
    10.199.190.156
    10.199.190.156
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31353600
    10.199.190.157
    10.199.190.157
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31353700
    10.199.190.163
    10.199.190.163
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31363300
    10.199.190.165
    10.199.190.165
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31363500
    10.199.190.168
    10.199.190.168
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31363800
    10.199.190.169
    10.199.190.169
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31363900
    10.199.190.174
    10.199.190.174
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31373400
    10.199.190.177
    10.199.190.177
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31373700
    10.199.190.184
    10.199.190.184
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31383400
    10.199.190.188
    10.199.190.188
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31383800
    10.199.190.189
    10.199.190.189
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31383900
    10.199.190.192
    10.199.190.192
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31393200
    10.199.190.197
    10.199.190.197
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e31393700
    10.199.190.201
    10.199.190.201
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32303100
    10.199.190.202
    10.199.190.202
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32303200
    10.199.190.209
    10.199.190.209
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32303900
    10.199.190.210
    10.199.190.210
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32313000
    10.199.190.211
    10.199.190.211
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32313100
    10.199.190.212
    10.199.190.212
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32313200
    10.199.190.213
    10.199.190.213
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32313300
    10.199.190.216
    10.199.190.216
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32313600
    10.199.190.219
    10.199.190.219
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32313900
    10.199.190.222
    10.199.190.222
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32323200
    10.199.190.225
    10.199.190.225
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32323500
    10.199.190.226
    10.199.190.226
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32323600
    10.199.190.229
    10.199.190.229
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32323900
    10.199.190.233
    10.199.190.233
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32333300
    10.199.190.235
    10.199.190.235
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32333500
    10.199.190.238
    10.199.190.238
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32333800
    10.199.190.240
    10.199.190.240
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32343000
    10.199.190.242
    10.199.190.242
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32343200
    10.199.190.243
    10.199.190.243
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32343300
    10.199.190.246
    10.199.190.246
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32343600
    10.199.190.249
    10.199.190.249
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32343900
    10.199.190.251
    10.199.190.251
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32353100
    10.199.190.252
    10.199.190.252
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32353200
    10.199.190.255
    10.199.190.255
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139302e32353500
    10.199.191.1
    10.199.191.1
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e3100
    10.199.191.2
    10.199.191.2
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e3200
    10.199.191.5
    10.199.191.5
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e3500
    10.199.191.6
    10.199.191.6
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e3600
    10.199.191.8
    10.199.191.8
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e3800
    10.199.191.13
    10.199.191.13
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313300
    10.199.191.14
    10.199.191.14
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313400
    10.199.191.15
    10.199.191.15
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313500
    10.199.191.16
    10.199.191.16
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313600
    10.199.191.17
    10.199.191.17
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313700
    10.199.191.18
    10.199.191.18
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313800
    10.199.191.19
    10.199.191.19
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e313900
    10.199.191.20
    10.199.191.20
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323000
    10.199.191.21
    10.199.191.21
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323100
    10.199.191.22
    10.199.191.22
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323200
    10.199.191.23
    10.199.191.23
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323300
    10.199.191.24
    10.199.191.24
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323400
    10.199.191.27
    10.199.191.27
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323700
    10.199.191.29
    10.199.191.29
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e323900
    10.199.191.30
    10.199.191.30
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333000
    10.199.191.31
    10.199.191.31
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333100
    10.199.191.32
    10.199.191.32
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333200
    10.199.191.33
    10.199.191.33
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333300
    10.199.191.34
    10.199.191.34
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333400
    10.199.191.37
    10.199.191.37
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333700
    10.199.191.38
    10.199.191.38
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333800
    10.199.191.39
    10.199.191.39
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e333900
    10.199.191.42
    10.199.191.42
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e343200
    10.199.191.44
    10.199.191.44
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e343400
    10.199.191.49
    10.199.191.49
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e343900
    10.199.191.52
    10.199.191.52
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e353200
    10.199.191.54
    10.199.191.54
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e353400
    10.199.191.56
    10.199.191.56
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e353600
    10.199.191.61
    10.199.191.61
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e363100
    10.199.191.62
    10.199.191.62
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e363200
    10.199.191.64
    10.199.191.64
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e363400
    10.199.191.65
    10.199.191.65
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e363500
    10.199.191.66
    10.199.191.66
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e363600
    10.199.191.70
    10.199.191.70
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e373000
    10.199.191.72
    10.199.191.72
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e373200
    10.199.191.73
    10.199.191.73
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e373300
    10.199.191.79
    10.199.191.79
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e373900
    10.199.191.80
    10.199.191.80
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e383000
    10.199.191.81
    10.199.191.81
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e383100
    10.199.191.82
    10.199.191.82
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e383200
    10.199.191.83
    10.199.191.83
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e383300
    10.199.191.84
    10.199.191.84
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e383400
    10.199.191.86
    10.199.191.86
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e383600
    10.199.191.90
    10.199.191.90
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393000
    10.199.191.91
    10.199.191.91
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393100
    10.199.191.92
    10.199.191.92
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393200
    10.199.191.93
    10.199.191.93
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393300
    10.199.191.97
    10.199.191.97
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393700
    10.199.191.98
    10.199.191.98
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393800
    10.199.191.99
    10.199.191.99
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e393900
    10.199.191.101
    10.199.191.101
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31303100
    10.199.191.102
    10.199.191.102
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31303200
    10.199.191.105
    10.199.191.105
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31303500
    10.199.191.106
    10.199.191.106
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31303600
    10.199.191.108
    10.199.191.108
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31303800
    10.199.191.112
    10.199.191.112
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31313200
    10.199.191.115
    10.199.191.115
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31313500
    10.199.191.116
    10.199.191.116
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31313600
    10.199.191.117
    10.199.191.117
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31313700
    10.199.191.119
    10.199.191.119
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31313900
    10.199.191.120
    10.199.191.120
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31323000
    10.199.191.121
    10.199.191.121
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31323100
    10.199.191.125
    10.199.191.125
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31323500
    10.199.191.133
    10.199.191.133
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31333300
    10.199.191.146
    10.199.191.146
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31343600
    10.199.191.158
    10.199.191.158
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31353800
    10.199.191.162
    10.199.191.162
    2014/8/5 10:07
    DHCP/BOOTP
    31302e3139392e3139312e31363200

    Hi,
    According your description, this may be caused by virus or malicious client.
    Please try to perform a network capture on your DHCP server. Then find the device which send these malicious discover messages.
    To download Network Monitor, please click the link below,
    http://www.microsoft.com/en-hk/download/details.aspx?id=4865
    To prevent this issue, you may implement NAP Enforcement for DHCP.
    Here is a checklist of configuring NAP Enforcement for DHCP,
    Checklist: Configure NAP Enforcement for DHCP
    http://technet.microsoft.com/en-us/library/cc772356(v=WS.10).aspx
    Hope this helps.
    Steven Lee
    TechNet Community Support

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