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A very long bathtub

https://en.wikipedia.org/wiki/Bathtub_curve

I have had the same experience with LEDs. If they make it past the first few months they'll keep running for years. I assume it's a QA issue.

Probably more a power quality issue. It is amazing how inconsistent the flow of power is in most people's homes. In large because it didn't need to be consistent in the past.

That's been my experience of LED bulbs -- either they die quick or last years. I bought a dozen of really cheap Chinese ones about 2011 or so. More than half died within 6 months, another crop in under a year, and I've got two of them that are still running fine 7 years later. They run probably 12 or 15 hours a day every day of the year.

Have you compared the brightness against a new LED of the same model? My experience with many higher-power (60-100w equiv.) bulbs is that they are quite a lot dimmer after a year or two of heavy use.