Uncontrollable Targeting

Time: Endless
Frequency: periodically
World Name: Excalibur
Character Name: Night Ride
NPC Name: None
Monster Name: All, any
Class/Level: Warrior/50
Party/solo: Both
In-Game Time: anytime
Area/Coordinates: Open world, random coordinates
Steps: 1. When using tab target scrolling while in battle, targeting begins scrolling really fast through monsters uncontrollably even when no key is being pressed.
2. Nothing stops this except focus targeting myself then clearing focus target.
3. Usually character dies in battle because I lose all gameplay control.

Internet provider: Xfinity /Comcast
Modem maker/Model Number: ARRIS/TM722
PC Specs: Dell Phenom 9650 Quad-core Processor 2.30
Internet Explorer Version: 10