I am using a Seidio retractable sync-n-charge USB cable to hotsync my 650 with my laptop. Whenever I tried to hotsync, I would have to plug and re-plug the connector several times until I was able to establish an active connection. I tried cleaning the contacts but found that this did not help. I discovered that the secret to getting a viable connection was to insert the connector so that the right side (the side where the power connector is located) made contact first. When I do this, I get a working hotsync connection every time. When I don't do this, I never get a working hotsync connection. Let me know if this helps anyone else.

Paul