Hi Sam,
Network issues, particularly intermittent ones, are very hard to diagnose.
The log helps, but unfortunately in this case it only shows symptoms, not cause.
Can you repeat this with multiple devices connected? I'd be very interested if they all lose connection at the "same" time.
My best guess is interference. Something else came online using the wifi. You may be able to see that using a wifi analyzer program. I like this one:?
--SteveT
