[BUG] USB and WiFi sync
 

WiFi sync usually works just fine but when i connect my phone via USB (charging) it loses the device and can't discover it... if i disconnect usb with wifi on it discovers it after few seconds.

I have a Samsung Galaxy S phone, the Captivate & the same problem is encountered. I am 99% sure that this problem started after updating to FROYO. The problem was solved naturally after a few days. Try turning your phone off & take the battery out for a couple of minutes.
Visit your local cell phone shop if the problem is not solved, because your phone is probably defected.

may not be the same thing, but i was using the wrong usb cable without knowing it and the wrong cable allowed charging. when i found the "right" cable, all was well again.