Originally Posted by dimastep
Thank goodness I am not alone!
I am experiencing exactly the same issue. After 5-6 flights which were great I am seeing what you are seeing. Try this trick: fly the heli for 3 minutes until it develops a drift. Then land it, disconnect the battery and reconnect it again. See if it fixes the drift. For me it does! Which tells me this is a defective board. I contacted HH but the person on the phone was reluctant to do anything and was saying something like the motors may be bad. When I told him "how come if I reconnect the battery it fixes things" he didn't say anything.
I know these posts are older, but I just got my Tandem and the problems listed here are exactly what I'm having. I wonder if Horizon ever update the gyro in these things? It sure seems to lose it's heading easy and starts drifting.