I've noticed that the touch wheel on the DX6i is extremely touchy and this has caused some problems, though not fatal ones. It's very easy to bump the trans into first or second edit mode and not know you've done it. I'm not saying that this was absolutely what happened in your case but it might be something to think about. I've landed a plane and looked down to see a different model displayed on the main screen. This usually has happened right after I've changed models and not verified that the current model was set.YMMV.