You people need to pull your head out of the 72mhz sand and get with the 21st century.
RF interference as we knew it is impossible with 2,4ghz .Ignition noise does not have the code to be accepted by the 2.4. receiver. If there is enough noise to wipe out the band the receiver will simply go to fail safe.
I would expect the op has a bad switch,receive,or battery..