my heli flys around fine, but I have one problem that develop like a month ago. Sometime the heli would make a counter rotating spin while in the air. lately I am just doing one tank of fuel at the field and it always happen with the first tank, 4/5 times the heli spin was when I was in a hover and trying to maintaing the hover for like a minute, and it always spin once. Now when it spin I would add collective so it could go up away from the ground. It fly straight in fff. I have a 9c with gy240 and a hitec 5625 digital servo. It started when I remove my s148 servo and switched my gyro avcs switch to on. I am thinking it could be the gyro acting up only in heading hold mode or it could be my new hitec digital.