Sounds like a issue with one of the RIO (Reverse Implement Option) switches, There's one on the dash and one on the reverse pedal assembly. It's evident one is intermittently making contact, I'd start by checking/replacing the one on the pedal......
Originally Posted by piston slapper
You never learn anything until you admit you don't know it all...
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!