Hi, I was having the same problem with my dx-2 I took a part the remote and everything was fine, but still with the problem of not connection, but did like a external push ( hit the each blade with your finger to make it rotate)to the dx2 blade when still on with the controller on also,and it work my dx2 is flaying again.
Remember hit as you hit a marble but softly and trying the controller to mait flaying .
P.S. recharge the drone to get a full battery power.
Good lock
Androi48.