Horizon tilting at high speeds

[Jar Jar Binks]

I have a P2 non-Vision with the H3-2D. Everything works fine, with great stabilization, except when I fly quickly forward or backward, at which point the gimbal starts steadily rolling to the right or left, only returning to where it should be after I come to a stop. The amount of roll isn't massive, but I'd say up to 10° or so. Has anyone else had this problem? Is it fixable?