I went thru the same problem just two days ago, i had to get the usb port replaced just yesterday, the problem was fixed but now i am getting random reboots I guess i will have to flash to fix it.

You can find all the info you need here http://talk.maemo.org/showthread.php?t=75920

btw mine didnt seemed abnormal either until the port was taken off, the problem was on the soldering underneath it.