Help! Aileron Stick Drifting After Flips

[Imozeb]

So something weird has been happening with my flights. I recently noticed that after a couple flips and rolls my brushless quadcopter would start drift rolling to the left.

I initially thought it was the gyro going bad, but I just did a flight with stick overlay (from Taranis logging, not blackbox logging) and I noticed that my aileron stick is off center after a couple flips. During this test, I took my thumbs off the aileron stick for the drifting part.

Here’s a video of this issue (starting at 2m14s for problem). You can see my stick overlay at the bottom right where the aileron stick is on the horizontal right axis. You can see that the stick is off center, but at the beginning of the video and before 2m14s it is centered.
https://youtu.be/BW5xkvrcKno?t=2m14s

After waiting a while, the sticks go back to center.

Why would this happen and how can I fix this? Is my controller breaking because this makes no sense to me.

Thanks!

[Kilrah]

Gimbal might be faulty.

[Imozeb]

How can I check and fix that?