Strange slow streaming and syncing problem - any diagnostics?

I have two Apple TVs syncing wirelessly via an Airport Extreme with an iMac and one of the ATVs has begun behaving very strangely. I've rebooted my ATV, and even gone back to it's factory settings (2.1) and updated it to the latest firmware again without success. iTunes is version 8.1.1, but I had the same trouble with recent version of iTunes too. The problem ATV used to work fine with iTunes.
Syncing has been intermittent and iTunes frequently 'loses' my problem ATV2. Restarting iTunes will usually find it OK, but sometimes I have to go into my ATV2 settings and re-select the Airport Extreme and input my security password again before it's recognised by iTunes.
Even when iTunes does 'see' ATV2, the syncing has been extremely slow. The display of 'Top Movies' thumbnails has also been very sluggish. Playback of movie and podcast material from my iMac / iTunes library has also ground to a halt. For the most part I just stream from the iMac, and have most settings for ATV2 set to e.g. 'sync selected Movies'.
But even when I've selected items to sync with ATV2 the syncing is very slow. Today a 200 MB .m4v file took about 18 minutes to copy across to my ATV2. Once it had transferred across it played fine from the ATV2, with none of the stop/start problems I'd had when streaming from iTunes.
My Airport extreme is in the same room and about 12 feet from ATV2. My ATV1 is in a nearby but different room, and works fine, even though it's further away.
Is there any way I can diagnose the cause of this issue, or does anyone have any suggestions as to what the problem might be? I presumed that a factory reset removed all settings on my ATV2 but is there a more extreme reset I could have done?
Thanks.

I can offer at least a partial reply to my own question.
I found lots of messages suggesting problems with the more recent firmware upgrade of Apple's Airport Extreme. So I downgraded from 7.4.1 to the older version 7.3.2 and afterwards my sluggish syncing and playback issues seemed to be resolved.
The file that took around 18 minutes to sync before now does it in about two minutes, and playback of files is normal. Don't know yet how well the older firmware will hold onto my ATV2 but I suspect all those issues were related and hope that will be fixed too.
If there are any downsides I'll update here.
Incidentally I forgot to mention that my ATV1 which had no problems with the Airport Extreme was an earlier model 1.x with updated firmware, whereas the problematic ATV2 had the later 2.x firmware, updated to 2.3.1. Both appear to be working fine now.

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