The forklift will operate normal and after a period of time it will just stop activating the fwd/rev contactors. If we bump it with another forklift, it will engage and go back to running normal again for a couple hours. I have changed out the fwd/rev contactors and the forward and reverse switches by the multifunction handle with no change. I haven't caught it yet when it was in the dead state to check voltage yet, but is there anything else that could cause that? The part that is confusing is just being bumped by another forklift makes it go ahead and activate and take off. Any suggestions?