I noticed it too, that besides regular system crashes ath5k gets "sluggish", as 
I it seems to have 0 upload and OK download (compared to wired connection).
The problem occurs though not right away, one just needs to wait a day or so....
Tried pinging and got 0% packets lost so far
I will now try to download a heavy file.
Let you know
My question to unggnu is though, do you see in your kern.log stuff like 

"ath5k phy0: noise floor calibration timeout"
If you do, you can read this thread linux-kernel-bugs #12647

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ath5k locks up system  in jaunty - "ath5k phy0: noise floor calibration 
timeout"  
https://bugs.launchpad.net/bugs/341952
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