Hostile client environment

I suggest a phone app to scan the local wifi's and take note of them. This post of mine from while back is about wifi mapping but you can use the same apps to help you diagnose the local area too.

(edit)

Actually re-reading your post. Just check your OSX client isn't auto connecting to another wifi. Maybe forget all wifi networks but yours just to make sure its not "falling" over to someone elses that is in range.

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