I still haven't found a cure for this. It's been happening for months and I'm about to throw it out as I nearly lost over 30 files because of this. Besides having 30 videos open all at once when selecting them to copy and paste.
This is my second M65 in two years and my last.
When clicking, there doesn't appear to be anything to force the mouse button back other than the durability of the plastic. My first M65 the plastic seemed to change possibly from stress from usage on the right click and was double clicking but as it is the right mouse button it wasn't as troublesome because a double right click doesn't perform an action other than in games.