not a solution, But I also experienced an issue with the scroll wheel on my Viper V2 Pro (it jumps , and kinda stutters.. like , when I want to scroll down fast , sometimes it bugs and doesnt scroll down or scroll down then goes up a bit then goes down)

Hi! i had some problem with v2 pro twice. It is very popular problem with razer mouses, edfective encoder. Its crap Razer mouses, i got my money back after that.  You can try this for fix:

1. Blow with compressed air into the mouse, near the wheels.
2. Try to turn up mouse and fast move mouse wheel forward and back with force on the table.

It could be fixed that problem for some time, but defective still waiting for return.

Get your money back, if you can and buy another mouse

Thanks, this worked for me. I was about to RMA my newish mouse until I tried your solution 2. Hopefully this is permanent.

number 2 solution works for my viper v2 mouse, Thanks!

i am having the same problem but i live in pakistan and there are no razer stores here i bought my v2 pro 4 months ago from the US what do i do can i claim the warranty online somehow?

Try binding scroll wheel up and down to mouse function scroll up and down accordingly. Its rebinding it to same thing again and it will go from white to green like you rebound it but you bound it to same function. For some odd reason this seems to have fixed the issue.  Now even when i revert back still seems to work. Now im unsure what fixed my mouse. But its worth a try