Hmm, that's weird - we've never seen that behavior. I could see that a network connection might result in a channel seemingly having no widgets, but I'm not sure how it could show a single (first) widget. The only way I *thin* it could to that is if it successfully go the channel information from our servers, but was unable to fetch the widgets but managed to run one that was already in the cache.
If that's the case, then the disconnection you're describing may not be related to your wifi, but rather something upstream. Just last night my ISP (TimeWarner) was having very weird behavior, even though everything was fine on my LAN and Wifi. The chumbys were each going back and forth between the offline clock and showing widgets, until my ISP finally went down entirely for about an hour. Once it came back, all of the chumbys went back online by themselves.
If this happens again, you might try ssh'ing into the device and trying to ping some servers - if you can't ssh in, then than means the problem is wifi. If you *can*, but you can't reach the outside world, then it's probably something on your LAN or ISP.