My Golf Cart will not go F or B sometimes

[Bluewatch]

Hello friends, First of all wish you all a magnificent 4th of July celebration tomorrow. My question: I have a 2005 Par Car Eagle 48v. S/N 5ED-35164-E5, and it was running good until recently. I have left home and the cart has stopped/died on me twice now. Turn the key F & B and it just clicks but doesn't move. Bring it home and a couple of hours later, try it again and it runs, go out and again it leaves me stranded... Since my batteries were Trojan 105 from 2013, I thought that would be the problem, so I bought brand new ones (DEKA GC10) to replace the old ones. The problem continues... What else can I do/check for? I depend on my golf cart to move around my community because the injuries I sustained during my military service preclude me from driving a normal vehicle. I really would appreciate any/all helpI can get on this one. Thanks!