More often that not with buttons its that they stop responding reliably, false clicks is curious how that's happening. Can you feel what's going on? The button just because too responsive?
At first I thought maybe my finger was pressing down on the right button by mistake, so i tucked my finger under my hand but it still did it.
It only did it when I was pressing left button. It was annoying as if I was trying to left click and drag to highlight some text it would do a false right click and I'd have to attempt to drag highlight again.
Othertimes I'd click left on something and the menu that appears if you right click pops up as well.
There is a couple of games that require me to hold right mouse button down to move the camera that I play, so I'm wondering if thats caused the situation. But as I say, I've never had a mouse problem before.
I bought a new keyboard/mouse combo, the same set, because its fairly cheap, and the new mouse is working properly.