SPA112 Reboot every 72 hours (3 days) exactly.

Hi,
I have a Cisco SPA112 which connects to a 3CX server. I also have addional phones, inluding Cisco SPA504G phones.
The issue I have is the SPA112 reboots every 3 days, exactly to the minute. This has happened 3 times now. The 504G is fine (40+ days uptime)
Nothing has changed on the provisioning of the ATA, when I do change things it reboots at 02:00 as expected, so I don't think this is related to reprovisioning.
I can provide more information e.g. logs if required, but thought I'd initially check if there is possibly a setting somewhere that I am unaware of that would cause this reboot every 72 hours exactly.
Thanks in advance,
Marcus

I should have included this information:
Product Information
Product Name:   
SPA112
Serial Number:   
CCQ162503NC
Software Version:   
1.2.1(004)
Hardware Version:   
1.0.0
MAC Address:   
C40ACBBC7XXX
Client Certificate:   
Installed
Customization:   
Open
System Status
Current Time:   
9/9/2012 22:13:41
Elapsed Time:   
00:35:12
RTP Packets Sent:   
0
RTP Bytes Sent:   
0
RTP Packets Recv:   
0
RTP Bytes Recv:   
0
SIP Messages Sent:   
24
SIP Bytes Sent:   
20821
SIP Messages Recv:   
23
SIP Bytes Recv:   
10833
As you can see the elapsed time is 35 mins, this ties in with the reboot event.

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