Lost connection between airport extreme and macbook air when transferring large files

Can anyone help...?
I have an imac and macbook air wirelessly connected to a airpot extreme being used as a router with a hard drive for sharing files accross the network.
It connects ok but when we try and look at a number of large files one after the other, or copy files from the shared hard drive onto the macbook air, the macbook loses wireless connection?
A very strange issue which i cant figure out....
Can anyone help?
Thanks
Shirmy

It could be a wireless interference or strength of wireless signal issue.
What happens when you connect the MacBook Air to the router via an Ethernet connection?

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Log files below.
May 13 16:33:33
Severity:5
Initialized (firmware 7.6.1).
May 13 16:33:40
Severity:5
Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 3).
May 13 16:33:40
Severity:5
Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 2).
May 13 16:33:40
Severity:5
Rotated CCMP group key.
May 13 16:33:42
Severity:5
Internet configuration leased [IPv4] -- host <10.1.1.3/255.255.255.0> gateway <10.1.1.1> dns <10.1.1.1> wins <> lease <86400> domain <domain.invalid>
May 13 16:33:45
Severity:5
(WAN) link state is Up.
May 13 16:33:46
Severity:5
Internet configuration leased [IPv4] -- host <10.1.1.3/255.255.255.0> gateway <10.1.1.1> dns <10.1.1.1> wins <> lease <86400> domain <domain.invalid>
May 13 16:34:00
Severity:5
Clock synchronized to network time server time.apple.com (adjusted +6 seconds).
May 13 16:35:21
Severity:5
Associated with station 30:7c:30:10:2c:b2
May 13 16:35:21
Severity:5
Installed unicast CCMP key for supplicant 30:7c:30:10:2c:b2
May 13 16:35:35
Severity:5
Associated with station 00:12:5a:c9:58:a8
May 13 16:35:36
Severity:5
Installed unicast CCMP key for supplicant 00:12:5a:c9:58:a8
May 13 17:03:16
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 17:03:17
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 17:03:54
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 17:03:54
Severity:5
Rotated CCMP group key.
May 13 17:05:23
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 17:05:23
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 17:22:28
Severity:5
Idle timeout for station 00:23:6c:89:4b:7f
May 13 17:22:28
Severity:5
Disassociating with station 00:23:6c:89:4b:7f (reserved 4).
May 13 17:22:28
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 17:22:28
Severity:5
Rotated CCMP group key.
May 13 17:33:40
Severity:5
Rotated CCMP group key.
May 13 17:34:07
Severity:5
Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
May 13 17:45:08
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 17:45:08
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 17:51:13
Severity:5
Idle timeout for station 00:23:6c:89:4b:7f
May 13 17:51:13
Severity:5
Disassociating with station 00:23:6c:89:4b:7f (reserved 4).
May 13 17:51:13
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 17:51:13
Severity:5
Rotated CCMP group key.
May 13 18:08:11
Severity:5
Idle timeout for station 00:12:5a:c9:58:a8
May 13 18:08:11
Severity:5
Disassociating with station 00:12:5a:c9:58:a8 (reserved 4).
May 13 18:08:11
Severity:5
Disassociated with station 00:12:5a:c9:58:a8
May 13 18:08:12
Severity:5
Rotated CCMP group key.
May 13 18:25:29
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 18:25:29
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 18:28:02
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 18:28:03
Severity:5
Rotated CCMP group key.
May 13 18:30:20
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 18:30:20
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 18:31:33
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 18:31:34
Severity:5
Rotated CCMP group key.
May 13 18:33:40
Severity:5
Rotated CCMP group key.
May 13 18:34:07
Severity:5
Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
May 13 18:35:40
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 18:35:41
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 18:46:08
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 18:46:08
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 19:31:34
Severity:5
Rotated CCMP group key.
May 13 19:33:40
Severity:5
Rotated CCMP group key.
May 13 19:34:09
Severity:5
Clock synchronized to network time server time.apple.com (adjusted -2 seconds).
May 13 19:40:02
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 19:40:03
Severity:5
Rotated CCMP group key.
May 13 19:48:59
Severity:5
Associated with station a8:e3:ee:b8:14:2a
May 13 19:48:59
Severity:5
Installed unicast CCMP key for supplicant a8:e3:ee:b8:14:2a
May 13 19:52:40
Severity:5
Disassociated with station a8:e3:ee:b8:14:2a
May 13 19:52:40
Severity:5
Rotated CCMP group key.
May 13 20:12:46
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 20:12:46
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 20:12:59
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 20:13:00
Severity:5
Rotated CCMP group key.
May 13 20:24:07
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 20:24:07
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 20:24:28
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 20:24:29
Severity:5
Rotated CCMP group key.
May 13 20:25:11
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 20:25:12
Severity:5
Rotated CCMP group key.
May 13 20:25:20
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 20:25:20
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 20:25:35
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 20:25:35
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 20:25:41
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 20:25:42
Severity:5
Rotated CCMP group key.
May 13 20:28:15
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 20:28:15
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 20:33:40
Severity:5
Rotated CCMP group key.
May 13 20:34:00
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 20:34:00
Severity:5
Rotated CCMP group key.
May 13 20:34:09
Severity:5
Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
May 13 20:41:19
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 20:41:19
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 20:41:25
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 20:41:25
Severity:5
Rotated CCMP group key.
May 13 20:41:38
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 20:41:39
Severity:5
Rotated CCMP group key.
May 13 20:42:07
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 20:42:08
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 20:51:31
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 20:51:31
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 20:51:54
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 20:51:55
Severity:5
Rotated CCMP group key.
May 13 20:51:58
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 20:51:58
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 20:52:12
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 20:52:14
Severity:5
Rotated CCMP group key.
May 13 20:54:41
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 20:54:41
Severity:5
Rotated CCMP group key.
May 13 21:00:28
Severity:5
Associated with station 00:12:5a:c9:58:a8
May 13 21:00:28
Severity:5
Installed unicast CCMP key for supplicant 00:12:5a:c9:58:a8
May 13 21:07:24
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 21:07:26
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 21:16:31
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 21:16:31
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 21:16:52
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 21:16:53
Severity:5
Rotated CCMP group key.
May 13 21:25:59
Severity:5
Idle timeout for station 00:23:6c:89:4b:7f
May 13 21:25:59
Severity:5
Disassociating with station 00:23:6c:89:4b:7f (reserved 4).
May 13 21:25:59
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 21:26:00
Severity:5
Rotated CCMP group key.
May 13 21:33:40
Severity:5
Rotated CCMP group key.
May 13 21:34:10
Severity:5
Clock synchronized to network time server time.apple.com (adjusted -1 seconds).
May 13 21:46:29
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 21:46:29
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 21:46:52
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 21:46:53
Severity:5
Rotated CCMP group key.
May 13 21:47:54
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 21:47:54
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 21:49:08
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 21:49:09
Severity:5
Rotated CCMP group key.
May 13 22:16:29
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 22:16:29
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 22:17:12
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 22:17:13
Severity:5
Rotated CCMP group key.
May 13 22:33:40
Severity:5
Rotated CCMP group key.
May 13 22:34:10
Severity:5
Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
May 13 22:37:40
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 22:37:40
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 22:38:01
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 22:38:02
Severity:5
Rotated CCMP group key.
May 13 22:41:19
Severity:5
Associated with station 00:23:6c:89:4b:7f
May 13 22:41:19
Severity:5
Installed unicast CCMP key for supplicant 00:23:6c:89:4b:7f
May 13 22:45:00
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 22:45:00
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 22:45:23
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 22:45:24
Severity:5
Rotated CCMP group key.
May 13 23:07:40
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 23:07:40
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 23:08:04
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 23:08:04
Severity:5
Rotated CCMP group key.
May 13 23:09:01
Severity:5
Disassociated with station 00:23:6c:89:4b:7f
May 13 23:09:01
Severity:5
Rotated CCMP group key.
May 13 23:09:43
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 23:09:43
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f
May 13 23:10:05
Severity:5
Disassociated with station 18:34:51:4a:4d:1f
May 13 23:10:05
Severity:5
Rotated CCMP group key.
May 13 23:33:40
Severity:5
Rotated CCMP group key.
May 13 23:34:11
Severity:5
Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
May 13 23:37:49
Severity:5
Associated with station 18:34:51:4a:4d:1f
May 13 23:37:49
Severity:5
Installed unicast CCMP key for supplicant 18:34:51:4a:4d:1f

I have tried a billion more things since, but the one that seems to have at least improved the situation is to downgrade Airport Extreme to 7.5.1 and change the channel from #1 to #7

Lost connection between airport extreme and macbook air when transferring large files

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