Interference? (2.4Ghz cordless phones, microwave, nearby wireless networks ovarlapping with your channel, etc)
Intense activity (eg: P2P) maxing-out the Atheros? (I've seen this happen with Ralink-based cards on OpenBSD)
If your problem can be solved with a quick "ifconfig down/up", then you can set up a quick-fix (VERY temp until you sort things out) via a cron job that pings a well-known host then brings the interface up if it finds that it's down.
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