It has come to our attention that a bug in the playback and vibration logging feature in the 3.10 firmware can cause auto-reset errors for SK-720 pilots. This issue does not affect the SK-540. This problem can be fixed by either turning logging off, or by swapping the existing SD card with a high-speed Sandisk card.
Please note that auto-resets do not shut down the SK-720 completely. The typical symptom of the auto-reset error is a twitch and sudden onset of drift during flight. Some users will encounter enough drift that cyclic and rudder inputs will be necessary to keep the heli level.
We are working on a firmware fix and will have it ready for customers ASAP.