According to the symptoms, it seems as if very sweet tea was spilled on it or something like that, that is, the LMB is pressed hard and sometimes there is even a feeling of the key sticking. I disassembled the mouse (it's easy, everything is on latches) - everything is clean, the microswitch on the LMB is pressed with a finger the same way as on the RMB, so I conclude that the matter is not in the microswitches, but in the mouse body itself - the LMB touches the body, which is why there is a feeling of sticking keys and loud click. With PCM everything is ok!
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