Wasn't there a hobbywing/hobbyking ESC that would switch off if you tapped reverse two (three) times?
Actually as a feature.
You've not got one of those have you?
I'd also look at rebinding/recalibrating the ESC. (check things like neutral bandwidth and so on)
Then reflashing the firmware/reprogramming from scratch.
Then rewiring everything.
(Do the sensor cable first, cos thats easy)
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