Both I and my friend have an issue with our mouse while playing ESO. The mouse right/left click buttons continue working, but moving the mouse does not move the camera for a few seconds. It resolves itself a few seconds later, but occurs again at random.
I use PC, she uses mac. Sometimes the mouse will only function on the x coordinate. Today I heard someone in zone complain about it too. It only happens in ESO, not other games or applications, and only started happening after the most recent patch.