My had no pattern to it. Would have days car was fine and days like last Saturday were I struggled to get home from home-deport 5 miles away.What is consistent is 16+ voltage spike and lights come on 1 second later. if the spikes keep coming you get trans fail and car starts shutting down. If spikes stop and you are not in shutdown( trans fail) car drives fine with ABS,4X4 and brake lights on.
In the early stages I would read codes and they would make no sense.