In video mode, when panning left-right, noprobs, tilt-panning, up, no probs... tilt/pan, down... halfway, or less, I get an alert: "Unable to rotate. Adjust gimbal attitude." This, while on a tripod.... so, adjust what, exactly, and where?
I had this error on my Osmo Mobile. Turned out when the gimbal hit it's endpoint of how far the hardware was capable of panning up. I first noticed it when using Active Track and Osmo Mobile in a fixed position on a tripod. When the Active Track subject would rise higher than the tilting limits of the gimbal I got that error.