My 2015 P85D has this problem
My 2015 P85D has this problem about once a year. It begins to drift on its map, then eventually freezes in place. The fixes you mentioned work for several months, then it goes bad again. It is dangerous when it's driving itself on the highway, loses it's bearings and drifts over to an adjoining side road, then it brakes suddenly, thinking it's on the other road with a much lower speed limit. We have noticed it seems to fail during periods of heavy rain. Has anyone else seen this happen with theirs, regarding rain? Anyone gotten any fixes that work, or explanations of what is going on?