Autosteer (I have FSD, v12 2024.26.8) is misbehaving. Set off from Oxford to Cornwall last Thursday, autosteer was fine down A34 but after a few miles west on M4 it was “temporarily unavailable”. After a stop on M5 beyond Taunton, it was available again. Moderate rain all the way but that has never interfered with it before. More @Wikipedia
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