I was getting -11 code while driving which didn’t cause stuff to stay powered down but it would stop applying power to the motor and I had to release the throttle and reapply throttle to get going again.
I too went for the throttle pedal but that didn’t fix the problem. Eventually I found that the 72V wires to my 12V converter were intermittent due to a poor recall application. They put sealer on which got into the connector and limited the electrical contact surface area. Documented here: Just purchased 2002 e825-4 where to start rejuvenation? - #87 by jagman