nRiTeCh
Northstar
For me and most of the people its exactly at or just after 3 yrs..Yes I have observed that Logitech Mice seems to be developing issues after 1.5 - 2 years of regular usage. This M570 which went bad after it was replaced in Aug 2020 or so. See below my earlier thread from back in Aug 2020 where my M570 mice was going bad and then I replaced with the one I was using until yesterday.