OK, I like Logitech mice; but they have a nasty habit as they get older of having the left click button become hypersensitive. I've tried all sorts of software settings, reloading drivers, etc all to no avail.
Well It turns out there is a mechanical solution to the problem. The following link provides information on one fix to the problem, especially if your mouse is equipped with the older OMRON brand microswitches. The Logitech Mouse Double Click Problem and How To Fix It! | The Red Ferret Journal
However if you are lucky(?) as I was to have newer OMRON switches a simple cleaning with crocus cloth or 600-grit wet/dry sandpaper will put you back in business. OMRON should gold plate these microswitches to eliminate the corrosion problem.
Anyway, a simple cleaning of the contacts will put you back in business. However; these parts are tiny and a jeweler's loupe on your glasses will make life a bit easier. Put a piece of electrical tape on top of the black plastic cover to keep the white piece of plastic that activates the switch in place. Once you get the cover off, find a way to keep the sheet metal part shown in the video from Red Ferret from flying off. It's a PITA to get it back on, and spring tension is critical. If it doesn't click, it won't work properly.
I've repaired both of my MX 705's this way with lots of bad words spoken; but I saved probably $150 in new mice over a lousy set of $2 microswitches I can get on FleaBay.
As I understand it, this fix may apply to Microsquish mice and other brands. Once again, the parts are frakking tiny, and I suggest you try this this at your own risk.