Counter Strike Global Offensive mouse bug on Windows 10

Hello,
Recently my Razer Naga Chroma has been playing up while playing Counter Strike Global Offensive. I'm not sure whether it's a windows update thats done this or whether it is a hardware issue? My mouse basically becomes soooo much more sensitive and goes up or down when I'm moving the mouse completely straight!

Just wondered if anyone had any ideas as to why this is happening and hopefully a way of solving this problem?

Thanks
 
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