I'm having this same issue on win7 with 5.0. Gettin to be really frustrating, use to be that I could plug it in and it would be good to go, now I have to plug it in unplug it and try different ports.
WOW..I am so glad to see others having this issue. I just got a new tour yesterday, I put on .230 with the 7.11 Hybrid on top. I went to move over my media files and it was doing the disconnecting reconnecting thing. I tried everything, took it back to sprint and they told me it was because i was running 5.0. I wiped device and went to install the official .57 for Sprint, and was scared because in the middle of installing .57 my Tour disconnected and the install stopped and I had to disconnect reconnect and retry. I was convinced it was a phone problem, but once I finally got .57 on there I was able to move all of my media over no problem.