Control problem

Well the 1st player side on my cab just basically stopped working other then the D button, this was mid match too. And prior to this it didn't show any "problems" or I didn't really have to fight with it. So it was rather abrupt, and in the middle of a match in ROTD. The 2nd player side works perfectly fine, I checked to make sure whatever happened didn't happen to that. So if you guys have any ideas on what I should check out to see what could have gone wrong, it would be appreciated.

Check all the ground wires/connections going to the A,B,C button switches..

IMO..it's a ground wire that came off somewhere(probably near-on the switches)

Make sure the Jamma harness is on good/not loose...and clean..