Might just be a failing battery, maybe check that first to see if that is what is causing the "Start/Stop" not being available - and borderline power availability chopping off the ESC as it is not "essential" - just a thought, that is all. Or scan the car for error codes with VCDS etc. This will give you more information on the nature of the faults.
Also there has been a case where the coolant sensor valve has been leaking onto a cable going to the ECU, the coolant has tracked along inside it into the ECU.