how it was. Drove me nuts!

In retrospect, not using the mouse for a while enabled the metal switches to work closer to normal for a while until their being worn out became apparent.

After further research, it turns out that my switches for the mouse clicking had just gone bad (you can only bend metal so many times). I found several sites that walked me through replacing them, basically just a ton of screws (about 30) that need to be undone and then re-done, to get to the actual mouse button switches, which they sell on Amazon for about $13 ($6 if you want to solder them). Plus another $12 for replacing the feet, which you need to pry up to get to the screws, and which seemed fine, but if your mouse feet is over a year old, you will notice the difference!

Took me about 1 hour to take apart, and about another 45 minutes to put back together. The only sketchy part was prying the very bendable battery away from where it was stuck. with gooey stuff.

But man! What a difference! It's like I have a brand new mouse! Cost me about $25 and saved me from the $100+ of buying a new one. And like I mentioned earlier, while the mouse feet looked and seemed fine, installing new ones made a hell of difference.

Plus, from reading about this, this problem is very common with almost all Logitech mice in recent years, and also very normal with many other brands. So if you paid a lot for your mouse, you might want to try this route before spending a ton on a new one.