Curious 36120 problem

[Gustav]

Yeah i'm not using lvc or ubec to keep these out the picture,so that's ruled out.
The reason for the high 11:1 gearing was it seemed less noticeable yesterday on higher gearing. Tried 14.75:1 through to 11:1 today with same results regardless of gearing.

It can't be 42K limit since it does it on 16 cells too.It doesn't seem to be a radio glitch either as it reliably/repeatably does it at anything above 80% epa,and there's no other glitching to speak of.

Below 80% epa it runs smooth but above that it glitches at full throttle.

So i'm thinking maybe a timing issue,although it runs smooth and cool up to 80% throttle.I'm a bit stumped on this one.

Only other thing i can think is batteries or wiring issue (perhaps not enough amps available or a wiring/bad solder joint issue).Lipos are rated 66 amps continuous.