Uncontrollable targeting

[Mastanight]

I thought it was a key sticking, but have new keyboard now. Its like I'm holding down a key to cycle through objects and my character will have a circle on him, also if I click my character during this time a targeting cursor appears on him but the cycling does not stop. I checked all key binding and see nothing causing this or one for it. It happens only sometimes but far in between and at the worst of times, if it was a simple all the time button press wouldn't it occur more often, any suggestions?