Physically clean the mouse, remove the battery and put it again and see if that helps. If you have to press the left click forcefully, there is a possibility of accumulation of dirt on the left mouse ...
The Ploopy Nano 2 has a PAW-3222 sensor with a 1,000 Hz polling rate and a default setting of 1,000 CPI (counts per inch), but support for up to 4,000 CPI.
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