HobbyJumper,
Losing a connection during flight is not a good sign. You may be having receiver or transmitter issues. I strongly urge you call Horizon Support and get this sorted out:
http://www.horizonhobby.com/Support/
(877) 504-0233
Hours of Operation:
Monday – Friday: 8:00 A.M. – 7:00 P.M. CST
Saturday: 8:00 A.M. – 5:00 P.M CST
Sunday: 12:00 P.M. – 5:00 P.M. CST