troubles with mouse

my mouse makes bad moves that i dont want. it suddenly launch the piece on a bad square. I didnt have the problem yesterday
but today i lost games because of this bug.
For example i want to play g5 and the pawn goes to g6?? Or my opponent took one of my piece and it is simply an exchange and i want to recapture his bishop but suddenly i cant because the mouse choose a bad square.

http://fr.lichess.org/cQHxmgGF/black#36

example of this bug, i want to recapture on h4 and the mouse played Qe7??

http://fr.lichess.org/pOru55jznivh

In this game i wanted to play g5 but mouse played g6??

Yeah, my mouse is the only obstacle to me getting to SuperGM levels. The damn thing keeps dropping pieces.

Your mouse only does what you tell it to, even if it's a mistake. If you're dragging pieces, then I guess stop doing it, and just use the two-click method.