I hope that the title of this thread alone indicates the wordiness and obscurity of this question which cannot be answered by Google. On my laptop there are 3 USB ports. I swear that on 2 occasions the best USB port (The one that can sync with my phone, transfer large files onto flashdrives, etc) switched to a different port. Another example is my wired mouse not functioning well on the 2 inferior ports. So is it common for the "best" usb port to switch between ports?