Calling All Computer Nerds *Ahem IT professionals*

[stormlord]

Not an IT professional, but a longtime nerd. Hmm, you say this problem is especially bad online? What do you mean, in a browser or just when you're using a program which uses the internet?

If I was you, I'd be using different programs doing the same thing with the mouse to see if the same behavior reproduces itself. I'd also try to shut off the computer, flip the power supply switch off (if it has one) and unplug the mouse and leave it unplugged for a minute, then plug it back in and turn the power on. I know that sounds weird, but once or twice I've seen similar with computers I've used.

You need to establish where the problem is coming from. If there's another computer in the house you may try to connect the mouse you're using to that and see if the problems continue. If they continue, the mouse is getting old or defective. Less likely, it's not supported well in the drivers.

In all my years, most mouse problems get fixed by replacing the mouse.

And anytime you have a problem with input/etc... you might also consider the keyboard. Sometimes keys get stuck and can cause problems. To fix just press every key and hopefully the stuck key becomes unstuck.