I’ve done a lot of Googling about this issue, and cannot find anything that works. I do not use any addons, I have reset my UI three times, and it is so bad I can’t play for any length of time before it happens. This is an issue only with WoW.
I use a Razer Naga Trinity, and at random while not holding either right or left click the camera behaves as if I am, the number 1 stops responding, and left click also stops randomly responding. I have to continually unplug and re-plug it in to get things to work again. This has me at my wits end.