I've been dealing with this for a while now but my patience with it finally snapped after trying to level in Summerset.
I use a Gamdias Zeus, and over the last few months I've had a problem exclusive to ESO that I honestly can't pin down a cause for.
Every so often when I'm moving around in game and using the mouse, the camera will veer around wildly, in some cases literally spinning my character 180 degrees in a microsecond, to the point where I can find myself suddenly running in the direction I've come from, or worse, trying to attack an enemy and finding myself facing away from them as my swings miss by a country mile.
Has anyone else had this issue, is it exclusive to the Zeus, and is there a fix for it?