FPS drops & DPI/sensitivity spikes when playing CS:GO

[srsm1k3]

Alright, this issue has been happening for a couple months now whenever I play Counter Strike: Global Offensive (the issue is unique to this game, I have never experienced this in anything else). About once every 1-2 minutes, my FPS will drop from 180-190 to around 30-40 and my sensitivity/DPI will spike to the point where little movements of my mouse will start spinning my screen. I don't really know where to start with this issue; I've reinstalled the game, reinstalled mouse drivers, and a couple other solutions I can't recall. The only thing I haven't done yet is reformat my SSD & HDD to a clean slate which I sorta want to avoid doing.

Specs!

OS: Win 7 64bit
CPU: AMD FX-8350
RAM: 8gb DDR3
Motherboard: MSI 970A-G43
GPU: 2gb AMD Radeon R9 270x (hooked up to 2 60Hz & 1 144Hz monitors)
Storage: 250gb SanDisk SSD, 1tb Seagate HDD
Mouse: Razer DeathAdder Chroma
Keyboard: Logitech G510

All hardware is running between 40-60C which is pretty normal for all my AMD equipment to run a little on the hot side.

If there is anything else I can provide for the troubleshooting process, I'll be glad to do it!

First time poster here, apologies in advance if this is in a wrong section or common info is missing.

Honestly, I don't believe its anything on my hardware end (except possibility Razer drivers screwing around), this didn't use to happen and this only started happening a couple months after I got the mouse. The thing I'm most worried about is finding that this is a software interference which would most likely require me reformatting to start fresh.

 

[Justinsanity]

Try putting these in launch options: -high -novid -refresh 144 -threads 8 +rate 128000 +fps_max 300

 

[rourou]

for fps issue I had similar story, try Alt+Tab switch to the desktop then switch back.
for mouse part I really have no clue, could something wrong with data sending through that usb port?
try Alt+Tab while fps droping to see if my method would help you.

 

[rourou]

And btw, my last disk was seagate and why it became the last because it f@cked with no reason. My desktop just could not boot windows one day, and repairing group of engineers told me there was no way to get any data through the connector on disk.So I had to re-download around700gb porn.And 1TB seagate HDD disk has higher waste rate than other brand does.