kman

I had the same thing happen to my 2012 wake 210 last summer. I thought that I was going to be calling for a tow. I stuck my head into the compartment in front of the steering wheel and felt the various wires and found that a wiring harness connector had come slightly apart. When I pushed them together everything was fine. 

I also had another incident where the power and key were on but the screen was blank and the motors turned over but didn't start. This is different than you scenario but what fixed this was turning the battery switch and key off and then back on. Some kind of computer reboot!