Mouse flys around or even off the desktop

[wts]

Mac OS Yosemite 10.10.4
iMac 2009 Desktop
using wired ( with tail ) mouse

Why does my mouse fly around or off the desktop
and
how do i fix that problem

 

[Fishrrman]

Clean the mouse ?

Or, if cleaning doesn't work, replace it...

 

[wts]

Thanks for your reply and interest in my problem.

In my OS 9 times it was a somewhat a simple matter to remove the rolling ball and clean it as well as the contact points.

How do i clean a USB mouse ?

When i turn the mouse over onto its back there is bright red light and i can't figure out how to or do clean it somehow ?

 

[DeltaMac]

Do you use a mouse pad of some kind?
Even though a mouse pad is usually not needed with an optical mouse, sometimes you will see a difference when you have an erratic mouse.
Even a plain sheet of white paper can work well as a test.