Well, I only use two brands of RX and two brands of servos.  The only reason for the two brands of RX is the glow drivers I have on two planes. 

That particular plane does have brand X servos but I have used them before without any problems.  In fact I have had these for over a year and have more on another plane, the RX is Hitec.

I tried it on another plane and got the same results that day.  However, after the next few days and since I have not had that problem.

Maybe it was a sun spot that day or maybe it was an indicator of a problem that is brewing.  Either way I'm limiting my flying to hardly any and only the small ones, keeping low and slow.  So the H9 Edge is in the rafters for a bit.