While flying today my P3 suddenly started spinning out of control, almost flipping upside down. I landed it safely and quickly. I looked it over and found nothing visibly wrong. Launched again and same thing. Next I started the motors up and just let it sit idle on the ground. No visible shaking or wobbling. Next I brought it up a few feet then landed again and let it idle. This time the motors (not sure which ones or all) started increasing RPM on their own. Motors were definitely reeving up on their own with no interaction from the remote. I tried this several times and in different locations and had the same results. Anyone have any idea what may be wrong? I flew yesterday with no issues. Thanks!