That sounds like a damaged USB port on either the device or the PC (guessing device.) Go to your carrier and get a warranty replacement before you are unable to back up/switch devices.
Last edited by Sith_Apprentice; 07-28-2008 at 07:52 AM..
CS might send you to a store they might not. Either way you have to call to have one warranty replaced. The 8100 is a device up to 3 and a half years old. If its over 1 year they wont do anything for you. Under a year you are entitled to a replacement as long as its covered under the warranty.