Couple things you could try before we do an RMA...
- Turn off any other RTMotion kit nearby
- Update from a different computer
- Try a factory reset... From a completely OFF state, hold down PWR+MENU
If the issue is physical...
- Remove the FHSS antenna cap... Underneath is a wireless module in 2x black sockets... Could it have become lifted out of its socket..?
If still no luck... We can issue RMA instructions.