Phone randomly restarts when mounted

[#1]

When mounted to my PC, my X8 shuts down and restarts frequently and randomly. After it restarts I have to re-enter my PIN number and the phone has un-mounted from the PC, so I have to start all over. Naturally this makes any sort of file transfer very unreliable and difficult. When the phone is just connected to the PC for recharging, I don't have this problem. I am running Android 2.1

Help!

[#2]

This worked for me

[#3]

Copy the contacts to your SIM card and/or Gmail?

In other news, my phone had decided that Fields of Gold should be the new text message alert (for some reason) and that was why it was playing that song. Once I figured that out, it was easy enough to make it stop. And mounting the phone in silent mode has kept it from randomly restarting (for some odd reason) this far.