Orion R10 problem

[OneKiwi]

Right I have had the R10 in my 4wd without problems

Tested it in a 2wd worked well for a bit but now I get a fault

ESC switched ON, no motor function,
no audio tone.
Battery or connection problem.
Check battery and power connections, check
switch
Damaged switch

I have resoldered everything including the switch and RX cables, even swapped them out but still get the fault .
Tested with other sensor cables RX and motors still the same.

It calibrates but with no audio tone and the motor doesn't work

Has anyone had this and solved it? Or is this a bin job?

Thanks