Viper V3 Pro

What do you mean by “sensor is bad”.

Are you on the latest firmware https://rzr.to/3tqyk9 v1.12.01_r1 ?

Yes im on the latest firmware and ive reset my drivers and everything nothing works the sensor is like not picking up  sometimes

I’d check different smart-tracking settings.

Also clean the mouse hole/sensor and I’d try different surface.

If you have the same problem problem I had, which is  sometimes a movement delay after lifting the mouse. I have found the fix. 

You go into razer synapse, mouse, calibration, the check the box where it says "Enable Assymetric Cut-off". 

After this I never have any problem with the sensor. Before I used to think hair got stuck in the sensor something.