So I have been away from home for about 2.5 weeks. When I left I was on 2.20.30 - I return to find 2.28.19. Either it's my imagination or my autopilot's performance on difficult roads has diminished - and by diminshed I mean the car seems to wander quite a bit more on low contrast freeway lanes on the 10 in Southern California than it did on 2.20.30. With 2.20.30 AP had gotten superbly good in difficult conditions. Assuming I am *not* imagining this - what could be the reason? Tesla testing out some new neural network learning? Re-building some of the lane maps? Changing things up while getting ready for 8.0 and/or the new hardware?