Try a glitch buster/capacitor on the receiver. Solved the problem for me with my TFR4s... it happened to me all the time using savöx servos, which are known to draw a lot of amps.
I bought high quality 6.3V / 3800 mF capacitors, put them on a servo wire and they seem to work fine stabilizing receiver voltage.
I had the same phenomenon with my Futaba 603FF receiver, by the way, so i don't think this is a TFR4 specific issue.
Cheers
Chris
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B44.1
Serpent S411
TLR22T
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