motors shut down

So I recently received my TH w/Realsense. Went out for the maiden voyage today (after a full calibration with appropriate approval beeps) and several things presented: moderate drift to the right and slightly descending at neutral stick positions Left Yaw caused fairly rapid climb Right Yaw...

I called Yuneec to alert them to a flawed firmware update. They said it was impossible and that I pressed B1 which shut down the motors. They refused to look at the telemetry which clearly showed the problem. The failure occurred on final descent with yaw to the right at the same time. It...