I have had a problem since I installed 10.10 on my laptop. I now run 11.4.
When I move the mouse cursor, it clicks a couple seconds after I come to a rest. I can move the mouse, throw my hands up in the air, and the cursor will click where ever it is pointing. This makes typing a real pain, even typing this the mouse put my text cursor in different places.
I thought this was a problem with my physical mouse pad, but I used a external usb mouse and I did the same thing.