hi waverunner, have you tried to re-bind the Rx & Tx if not. with the transmitter switched off, switch on the receiver power switch
the led should flash inside the receiver, press the little binding button on the side of the receiver, then switch on the transmitter.
When the led on the receiver stops flashing they are bound together again. ( use fully charged batteries ).
If that does,nt work, have you checked the battery connections, I dropped my T5 out of the car boot and the knock bent the
negative tags and made a intermittent fault when used.
hope this helps
john