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Have you tried turning the mouse off, rapidly left and right click for 30 seconds or so, then turn it back on? I had a logitech gaming mouse that was double clicking randomly and these steps from the logitech support site fixed it.
I read some where this has something to do with a design flaw in the Omrom 50m switches Logitech uses in there mice but IDK if that's true or not.
This basic troubleshooting step will fix this issue on a lot of mice as I think the main cause of the problem is dust or something lodged in the switch and this procedure forces whatever is in there to dislodge itself. I have also found a couple of well placed bursts of air help too.
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