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[BrianG]

Are you using the stock AM transmitter? AM in general is quite susceptible to noise. When I was using my old TQ3 at home, it would glitch only at a certain time each night. Persumably, there was something in the area that was high enough power to cause interference. If everything else checks out, all batteries are charged (receiver pack and transmitter), and you truly haven't changed anything, I would try taking it somewhere else to see if it still happens - it could be something in your area.