IF there is a problem, you should be able to locate it on the ground. You'll need a helper to do the checks.

Put your model on a stand or table and secure it very well. Turn on the transmitter and receiver and operate everything. Do it for the 10-15 minutes you'd fly. Put the transmitter antenna all the way up. Walk away and check it at various ranges.

If nothing's happening, go to the next step. Keep the model on the table, and make sure it's well-restrained. Start it up and perform the same series of checks with the engine at various throttle settings. If you're getting a glitch from the engine's vibrations, then this should bring it out.

If nothing's going wrong, even at a long range, and with the engine running, try flying the model again [make sure the batteries are charged! Ask me how I know! ]

If you still get the glitching, is it really something in the airframe? Some kind of outside interference? Can you put the system in another model to see if you get the same problems?

Of course, if you have a glitch with the model on the ground, check to see if it's a servo or such. Transmitters rarely have problems, but it's always possible.

It might be something that comes up only once the transmitter's been running a while and warms up.