Mouse feels slower at same dpi as before

[s_technogeek]

Since few days I feel like my mouse (Logitech g403) is slower at the same dpi (for eg 1600) as it was before.
I found out that if I switch usb ports or use surface tuning in the Logitech gaming software it gets back to its original sensitivity at that dpi(1600) but only for a short period of time, after that it becomes slow again.

If I need to get it back to that same sensitivity as before I have to increase the dpi from 1600 to 2000 to get same sensitivity feel.

I am not sure what's happening! 

Is something wrong with the mouse lens?

[MoonlightSylv]

Did you change the sensitivity in Windows/Games?

[s_technogeek]

8 minutes ago, ShadowTechXTS said:

Did you change the sensitivity in Windows/Games?

sensitivity is same in the game.
But I did turned off the acceleration in "ease of access center > make mouse easier to use > setup mouse keys > acceleration option under pointer speed".

[MoonlightSylv]

3 minutes ago, Sanchit_technogeek said:

sensitivity is same in the game.
But I did turned off the acceleration in "ease of access center > make mouse easier to use > setup mouse keys > acceleration option under pointer speed".
 

That could be it.

[s_technogeek]

Just now, ShadowTechXTS said:

That could be it.

Even after that I felt only a minor change but not this much, and it does gets back to the original sensitivity if I surface tune the mouse or change the usb port but the change lasts for like a minute or so then it becomes slow again.