Issues with the force touch sensor are fairly common across Series 2 and Series 3 of the Apple Watch. Some attribute it to a software glitch fixed with an update. However, the force touch sensor will need to be replaced if your Apple Watch is still acting up after the update.
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Replacing the force touch sensor is a complex job requiring a lot of time because the sensor also functions as a gasket seal. The sensor consists of two layers that are glued together. Opening the watch separates the layers and compromises the seal. That’s why it is so important to be careful when attempting a replacement. Its complexity depending on the series of your Apple watch varies, and so does the time it takes to replace the sensor. That’s why the sensor replacement price for each series of watches is different.