Windows 10: Cursor quivers, clicking becomes iffy

From time to time, My cursor starts to quiver. I can move it with the mouse, but clicking on anything susually has no effect (nor do keyboard function keys). It seems to happen more when I have a browser running. Eventually it goes away, but eventually isn't soon enough.

:)

 

Mouse cursor becomes tiny when clicking middle mouse button

Setup:

• High PPI monitor (4K resolution, 15 inches), scaling set to 250%
• Windows 10
• Microsoft Intellimouse Explorer 3.0 mouse
• "Windows Black (large)" cursor scheme

Whenever I click the middle mouse button on my Intellimouse the mouse cursor suddenly becomes tiny. This problem can be temporarily resolved by opening Mouse Properties and changing the Cursor Scheme.

Is there a permanent solution to my problem?

This is mouse cursor at normal size:





And this is the same cursor after I click the middle mouse button:





(The screenshots will naturally be very large as they're taken on a high PPI monitor.)

 

Mouse cursor becomes tiny when clicking middle mouse button

It turned out the problem was with the Lenovo Compact Keyboard driver. I'll take it with Lenovo.