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 (you ship to us and we'll fix it - almost certainly under warranty), OR if you are happy to pay for the shipping from us to you:- we could ship a replacement to you directly (which you can keep), and then you can return that one to us via a slower/ economy courier.