Hit the controller port on the system with compressed air, and make sure you clean out all of the holes.
On the tap, of all 5 ports, on which of the ports does the issue(s) happen?
1, 2, 3, 4, or 5?
And is it always the same problem? (i.e. If you plug into port 1 the start button goes wacky, or if you plug into port 2 left doesn't work) or are the problems random?