I did a /bug report on this but wanted to post here, too, in case there's an easy solution to this issue.
It's been since around Patch 12.2 'ish. Sometimes, not always, when I load into a zone -- and, sometimes, when I just get an onscreen message that I've entered a new "zone" (i.e., Staddle from Bree or whatever) -- and start running my cursor doesn't come back after I take my finger off the mouse button AND my character keeps running even though I'm not touching my keyboard. If I press "s" to try to stop him, he starts going backward without stopping....or sideways, if I use the strafing keys. It acts as if keys are sticking on my keyboard but I know for a fact that's not the problem. Eventually, after about 30 seconds - or after I've gotten frustrated and started pressing every key on my keyboard trying to stop him -- he stops and acts completely normal from that point onward until I port/map to another location. Then there's a chance it happens again.
It's very annoying, especially if I port/map into an area where mobs are nearby and my character just starts running off into them and I'm unable to fight because he's running.
ANY help would be /greatly/ appreciated.
Thank you for your time.