I saw it happen again at the local rug this weekend.

It appears to be a BEC issue in this one.

He was running:
Air 257 servo
LRP Q1

The light on his PT would go dim and the Spekrum Rx would go into failsafe.

It would shutdown for about a SEC or so, then come back on.

He replaced the system with old stardard Tx/Rx and no issues.

He was able to reproduce it on the bench also.

We did not try the CAP fix, but that is next as a test.

On a side note: he runs the exact system(Tx/Rx/servo) in his gas cars with no issues.