Do you have back up alarm. If you do the problem is most likely the switches. lift up the cab and look where the linkage hooks the the bell cranks. I would bet one of the switches is bent over and the bell cranks have a lot of side to side play. no use in replacing switches if you don't fix the...
Please bolt your cab down. I rolled a machine on its side and I can tell you its a bad feeling when the cab tips up as your rolling over. Could have been very bad.