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Similarly, even the higher-priced Logitech mice often use tact switches that are only rated for a relatively low number of clicks (probably 1 million?), so many of them started failing on me after about two years. Replacing the switches with higher-rated ones (50 million clicks) is trivial on all the mice I have disassembled so far. The switches and replacement glider pads (which need replacing after removing the screws hidden below them) are often just a few bucks but make the mouse last for several more years.
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That was a frustrating fix.

The MX Master has a "gesture" button under the rubber where your thumb rests.

I don't believe I ever used it intentionally.

But because it is a gesture button, when it fails the mouse no longer responds as it always thinks it is gesturing.

Pull the wire and it is fine, but diagnosing it is rough.

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I feel you. Here in Europe you have to pay around 100 bucks or more to get some decent quality from Logitech. In the past I used mice like the G9 which was build like a tank. Nowadays it's something like a throwawy part, even in the higher price range. Same goes for keyboards, which I tend to build now on own.
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