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I have this issue myself, haven't looked into it yet but from reading on here it seems to be the connections to the rear light clusters. Check and clean those.
Bad earth to the rear lamps! Get someone to run through the lights while you watch which ones are playing up. Clean the terminals and make sure the connections are secure!
I had the same problem, tried all the tricks, solved the issue by putting LED lights in, they draw almost nothing so you don't get any shorting out... slightly duller than normal bulbs but I can live with that