Here's an update: I tried a new GPS module, no change, next a new PMU, no change. I then tried a new Master Controller, no change. 7 months since I bought it so no help from the vender I bought it from and have sent an e-mail to DJI USA and have not heard back from them. vtaildriver, yes I have had a few crashes so that is probably it. Please tell me more about repairing, what exactly do you do? Thanks John