Today I flew my 'corn during lunch. I know the setup can draw 30A+ on the bench so I usually run at about half throttle (which is 10A on bench).

After about 10 minutes, it got real squirelly and then spiraled in (which I managed a pancake landing in tall grass).
On the ground I noticed the starboard elevon was fully deflected up. The port elevon was jittering, and the motor was spazzing.
I took it inside still in this state for a closer look.
Nothing too hot.
Still spazzing.
I disconnected the batt for a moment and reconnected. The ESC beeped normally then kept spazzing.
I DC'd again for about a minute and reconnected. Things were back to normal.

So I flew...
Same thing yet it happened after about 2 minutes. Interestingly, the starboard elevon was drawn tight up, and the other one jittering. Motor spazzing the same way!!!

So it's a "reproducable" glitch.

Postmortem the batt is at 11.74V, which is fine??.
Heatsink was not too hot. ESC was warm but not hot.
Batt in fine condition, slightly warm.

What is going on???

Unicorn 48" wing
TP 2100, 10C discharge @ 3S2P = 11.1V, 42A
HiTec Electron6
Castle 45A ESC (don't recall what it's LVC is set for...)
Mega 16/15/3
Clamshell heatsink
Zagi 5x5 prop

Thanks a million,
MTEXX