FC Gyro Drifting? Buzzer beeping when dropping throttle?


I’ve been flying my micro 3inch for a while and its been fine. I am using an Omnibus Nano V2 FC.

When I do flips and drop my throttle to zero (airmore enabled) my quadcopter’s buzzer beeps one or twice. Is this normal?

This last flight, when I did a double flip over a tree, my quadcopter’s buzzer beeped. Then, when flying level, my quadcopter kept wanting to roll slowly to the port side. Is my gyro breaking or is this beeping calibrating my gyro’s offset or something?