Depending on the mouse you might be able to fix this.
I've had two mice develop this issue, one I had to send back (Razer Deathadder) and another (which I still use), a Roccat XTD Kone, which I managed to fix.
I looked for a similar fix for your model and came up with this:
Link Removed
Failing that you may need to reset the device. MSI might have a little app which will do this for you?
Roccat sent me one for my mouse so perhaps MSI do one for their mice too? Contact MSI support in this instance.