Other Fuel System Pump problems of the 2011 Volkswagen Touareg

This has happened multiple times, at low speeds, car goes into limp home mode randomly and creaks along at 8 miles an hour, most recently lost braking power and message comes up "hybrid error, pull over in a safe location. " then when you turn it off and on again it works fine. This is not helpful as there is no information for the mechanic to go by to solve the problem. We have replaced the catalytic converter, both fuel pumps and pre-fuel pump mechanisms and still the odd error message lack of car running. I am thinking about using it as a planter in my yard, currently is it living with the mechanic waiting to behave badly again, so he can try and the problem, but not driveable by an ordinary citizen. It has happened, while slowing down, while turning, all at low speeds, but that doesn't really help much. I still can't drive it. It has 138k on a hybrid engine. It was rear-ended and repaired about 3 years ago, but it ran fine after that for a couple of years. This is a mystery problem.