Screeling, I think you're setting yourself up for disappointment, again, a couple years down the road.
Wireless mice introduce two more points of failure (namely, the battery and transmitter/receiver system), and I'd wager dollars to donuts that it's the wireless transmitter/receiver (or interference issues) that is causing your current problem, rather than a mechanical defect with the button or sensor. So replacing it with another wireless device, even if it's a trackball, isn't going to fix the problem down the road, you'll still be open to that bug again.
There's a simple fact: wired mice (keyboards, too) are rugged, durable, and last for ages. My experience with wireless versions says they're not. And it's not some problem with build quality, or brand, or defective parts. It's simply that the stuff it takes to make something wireless doesn't have the working life of the rest of the device. So if you're upset at having to replace your input device after 4 years... getting another wireless input device seems silly to me. It's like the definition of insanity as trying the same thing over and over and expecting different results.
Now, if I've read the tone of your original post wrong, and you're not annoyed at having to replace your mouse, please disregard me, here.
_________________ "Aaaah! Emotions are weird!" - Amdee "... Mirrorshades prevent the forces of normalcy from realizing that one is crazed and possibly dangerous. They are the symbol of the sun-staring visionary, the biker, the rocker, the policeman, and similar outlaws." - Bruce Sterling, preface to Mirrorshades
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