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It seems to me that the RX could have been exposed to direct vibrations from the frame through the black strap, regardless the foam that may have been underneath.

Try to isolate the RX completely from the frame in the new layout, which I don't see now.

Also, always range check the radio system with the engine running at low and high revolutions, and standing as far away from the model as possible.

I believe you should be careful and prepared for an emergency in the following flights, but not too afraid.

Regards!