You tried calibrating the tx/rx/esc.
I had a similar issue for several weeks, until I worked out that the esc wouldn't finish it's self test/start up until it had a zero throttle signal from the rx.
Which it wasnt getting, that tiny bit of drift in the electronics was giving just enough throttle to throw the esc, but not enough to make anything move. Not a vampire esc, but it's worth trying!
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