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Reason behind dancing AP2 lines

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It's not unusual for sensors to have small variations between readings. Software will usually average this out so the display is smoother.

But, if there's a hardware problem causing larger than expected variations, the problem should be checked at a Service Center.

Seems worthwhile to submit a bug report and possibly also send an e-mail to Tesla and give them an opportunity to provide confirmation it's a software problem or have them direct you to a Service Center to review the problem.
 
FWIW, my AP1 MS with 2.52.22 does this sometimes when stopped at a signal behind others. It also does it when parked (after switching into "P") in multiple parking lots -- more likely when there is an empty stall with clearly marked lines in front of me. I never had this bouncing line thing occur until the most recent release and have had it occur several times since it became available (I don't keep an exact log).