so filing is a good idea here, got mine for 2 months,

i was not aware of this issue for the first week. during that week, iwas plugging the n900 to my laptop almost 3 times a day! (i am very excited...until now) and charge it once every 20 hours!!

so before i filed mine, there was almost over 30 plug and un-plug cycles occurred! then, i read about the usb port issue. Whew!