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I took the heli up in hover to check the headspeed. The tail was making some strange moves. Little up and down, but a little sideways too. After getting the headspeed right, I flew the battery empty, and put in a new. I wanted to check the headspeed one more time. When I had hovered for about one minute the tail suddenly took a 90 degrees turn. I put the heli down to check it, but didn't find out anything. I flew 2 more batteries, but on the fifth when I was taking some tic tocs and stopped inverted, the tail suddenly did a new 90 degrees turn. I got the heli down without crashing. I went home, and checked the heli, but didn't find out anything. I put the gain down a little bit on the elevator and about 5% on the tail. The next time the weather let me fly, I took the heli up in hover again. The tail was still doing the same as before. I took a back flip, and put the heli into inverted. No problems. Then I took the heli down, not inverted, and held the heli about one yard above the ground. Then I turned it 90 degrees to see how the tail was doing. Then suddenly the heli started to turn 360 degrees, and didn't stop turning. So the only thing I could do, was to press the throttle hold switch. And the heli crashed.
I am a VERY big question mark! Does anybody know why this is happening, or have any tips in this case? I would be very thankful for all help I can get.
I use a ds 620 on the tail, and ds 510 on cyclic.
Greetings from NORWAY