This problem is now officially driving me nuts.
iPad1, iPad2. Since the 2.0 upgrade, both lose sync repeatedly when docked. No other apps running. As a result I've completely abandoned using break music from the docked iPad. And it really annoys me when sync disappears right while I'm making quick adjustments between songs.
It really seems like whoever did 2.0 broke docked sync badly.
To add insult to injury, at a gig tonight the wifi wouldnt connect at all, despite the network connecting successfully and giving out IP address etc to the iPad.
The Master Fader config panel sees the device but message just says "Not connected".
Seems like somethings gone wrong with the RJ45 socket, either in the Airport Express or the DL1608. I tried 3 different network cables.
Like others here, I usually dont have problems with wifi syncing and always run the DL1608 and Airport Express from a good UPS. I take good care of my gear and it isnt used by others.
For now, I'm assuming the wifi problem isnt serious. Testing everything in my studio tomorrow to determine which bit is misbehaving.