Yes there is a BIG problem with the Optic 6, and I'm so gald I read up on it before I bought one. Check out this thread:
http://www.rcuniverse.com/forum/m_44..._1/key_/tm.htm
Not only is there a big problem, but they know about it and still will not recall the unit. Some one is going to get seriously hurt or worse. People are losing planes because of this unit. I suggest reading the whole thread.