Mouse for Mac

Hi, I have a Mac mini. The mouse is driving me nuts. It is a run of the mill, non Apple, Wireless, but not bluetooth, mouse. There is a scroll wheel in the middle. This button is driving me crazy. Whether I am viewing a web page or a text editor, when I try to scroll up or down with this wheel, the page on screen will go up and down randomly for a while before it settles down in one place. I often lost my place on the page because of that. It is very very annoying! What causes it? Is there a way to fix this? Thanks.

BTW, I thought the mouse was dimity, so I cleaned it, but no improvement.