Recently started flying my second HBK2 using the same TX, just swapped crystals. Well I now have some sort of glitch in the main system. No glitch in the tail that I've noticed. I'll have it in a hover just a few inches off the ground and suddenly the servo(s) will jump. It happens real quick, and recovers just as quick. At first it was causing a quick jump to the right. Now it seems to be causing a quick reduction in pitch on all three, causing the heli to drop real quick. But it always recovers just as quick. It's like a quick couple inch drop, then just as fast a couple inch rise. Only pattern I've noticed is it only seems to happen with power applied and light on the skids. Sometimes it will happen in quick successions, and at times a minute or two apart. TX battery power still showing in green, although it's the last green before going yellow.

Any thoughts?