It was the ESCs!! So... The 3 on the left do the same crazy stuff
That’s pretty weird that three separate ESCs, of different brands, would fail in the same rare way. It’s possible that either the receiver or one or both of the servos is drawing more amps than normal. The reason why two of the ESCs work is that those two might have a higher amperage BEC.
I think you did rule out the transmitter. So probably either the receiver itself, or possibly one or both of the servos.