Problems with razer imperator

Try resetting the mouse to its firmware defaults, try setting a lower dpi and polling rate to see what happens. Tbh I've had issues with all of my Razer products at one point or another, personally I recommend you return it if you can and grab a decent mouse from Logitech or Steelseries or something.

so you are saying that razer products are pretty much all faulty? My razer abyssus died after 1 year of usage, its left mouse is unclickable.

Not at all, but they're generally not considered to be all that great. If you can return it, I would recommend you do, however you can always try what I suggested and see if the failsafe settings help at all