It is almost surely the auto reset circuit breaker. When they start going bad they will trip, cool down and reset, then trip again and repeat.
Will look something like
this.Available at RV parts stores and many auto parts stores. Check the side of it for the amperage rating.
But if it only started doing that after the repairs then I would be concerned that it was binding somewhat on travel and causing increased amps pull as the motor strained to move the slide. Would be a good idea if possible to have the repairing facility check it out.