I have been dealing with this issue for 6 months,with Rift.And noticed it here few times. And I'm positive(for me),That my Naga mmo mouse is on its way out.Well I know it is. And it's even worse for a mouse turner like myself,Random spinning into walls,Etc. I will be buying a new Naga soon.And hopefully it will be solved.But I've grown used it now so will see. (These issues have nothing to do with swtor, Confirmed in 3 different mmos so it's me) The issue started around same time when my R-click was double buying stacks,having trouble talking with npcs/quest turn ins, windows open and close with 1 click etc. etc. Anyway I'm using a Razor Naga.And from tons of forum posts I've read on this issue,It seems like people that use the Naga are more likely to experience this.