Aside from the vast majority of nosedives that are user error: Unfortunately the only fixes are to ride slower or accept the risk :/ We have to put our faith in these things as they keep us upright. Even the smallest hiccup in its gyroscopic calculations, delivery of corrections to the motor or in the motor itself, will cause us to come off the board. Has a computer ever frozen up on you or BSOD? Imagine if each time that happened you'd nosedive. Another fix would be to get your top speed on foot to 15+ mph for safety purposes. It's a lot easier than you think. The only TRUE fix, however, would be to ride a board with 4 wheels. Where's the fun in that?! :D