yea I have mouse problem too!
since my good microsoft mouse does I'm using shitty HP mouse that came with my comp,
when I play it's ok but when I leave it it starts shaking and cursor slides down :/
do u know what's wrong with it?
is it mouse or software related?
are u using a mousepad?? cuz if the sourface is very slice or very reflective that can be the problem...
if not.. the shitty mice have a led instead a laser (optical mice) to trak the movementso.. so..the precision is weak and tend to get fucked up really quickly.. also are afected for any kind of light.. I have a shitty optical mouse and sometimes gets own life and tend to go up lol..
and is not only when u leave the game I think.. if ur mouse starts shaking and going down.. go in game and put the max sensitive and I maby u will see the same movement... I know this cuz I used to play with 12 of sensitive and my mouse used to have own life .. now I play with 3 and I cant really notice it..