Purchased November last year, worked perfectly, about two weeks ago the left button stopped working reliably, had to do a few clicks to try to turn it on. I suspect some switch sensor is weakened. Question, try again? This is one of the smallest wireless mice, 6 months of use is really a problem. I have other Logitech mice that have lasted 5 years. maybe small size will result in poorer design. Shopping at a brick store to see visually if bigger is better. UPDATE: I bought another M187, can't reach the size. I reported the issue to Logitech and got a response (new battery, remove battery, turn device on and press buttons for about a minute. Didn't help much). The last point was the use of compressed air on the buttons. this seems to have worked so far. So I'm increasing the rating while it works!
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