I recently bought Sins of a Solar Empire: Trinity, and was having a problem with the mouse being too sensitive and jumping around in the menu to where I couldn't reliably click on any option, it would jump past any button when I got near it. I did some digging and found people suggesting to disable Pointer Trails as well as Pointer Shadows, or enable default windows cursor.  I've also seen posts about video drivers being updated, etc.  After trying all those options, on a hunch I disabled the "Enhance pointer precision" and then it behaved normally afterwards. This setting in Windows 10 is found in Control Panel > Mouse > Pointer Options and under the Motion section. 

I just wanted to get this out there as I couldn't find this as a potential fix documented during my searches.