My TX is at question as well...have some issues with it, because it was bought Second-Hand.
However, the problem was showing up as full up elevator ( Tail-heavy )...neither was pilot-error. Tail-heavy is a condition that limits pitch trim and makes a plane uncontrolled at low speeds. As long as there is airflow over the elevator I should have been able to stabilized the plane and land. Both planes were in a CG range suitable for the design, and incidences were according to the kit.

So I have some electronics issue at hand, with a peculiar condition...high-rpm inrunners, and a specific flying location. So if I miss my guess, we have an unwelcome guest at WFC with some "2.4 splasher"...

The unwelcome guest could be high-tension power lines, other radio transmissions, or simply a re-curring glitch in the TX. I will continue to test the TX in actual use...in a safe area.

If you're using a B52 with 8 "Motors" I would filter the bec on the speed controllers, with 1000uf capacitors on all 8 controllers.

Again, a bec issue with the EDF's I have to eliminate...I MUST use a filter cap,,,