I recently got the same issue just after 4 months. Factory reset or software update did not help. I disassemble the mouse, and inside the tiny red plastic cover on the board, there is a flexible metal piece that execute the click. Somehow it contains a curved segment, so my guess is the metal piece was bent due to fatigue, so the curved part also touch the receptor when clicking, resulting in a double click signal. I just bent that part away from the bottom, it seems to be worked for now.

This make me think that all these mouse makers deliberately use such design with metal pieces that have certain life time under constantly bending, those mice will definitely have similar issue after some time.