It's my Dx6i.

I think there were two problems happening last weekend. Firstly my motors were really big and might have been drawing too many amps, full forward or reverse caused them to cut out. I limited them down to 50% in Mix 1 and Mix 2, not sure if that's the right way to limit them but it seemed to work as I could throw it full forward to reverse and it worked fine.

The second problem was that with the mixing on it could only go forward, backwards and turn on the spot. It wouldn't drive if the stick was moved diagonally. It may have been an amp issue but they didn't really move at all, although on occasion on wheel wouldn't move and the other would go full pelt.

Guiliherme said it was something to do with the cheap Orange RX's signal not being interpreted correctly by the ESC's. I know there were similar problems with Binky. He was running the Orange RX, Dx6i and GR02's and it wouldn't move when the stick went diagonally but when he swapped the RX out for a Specktrum AR6110 he had a full range of movement.