Just anecdata, but I have been running with non-pro AirPods for years with no problems like one you describe. I tend to sweat a lot, so by the end of the run they are pretty wet. No shorting or other electrical issues.
The only problem I've had was ear wax buildup (yeah, gross, I know) with the first/second AirPods generation (the ones with the long stem). I was able to use alcohol & hydrogen peroxide to clean them up a bit, but eventually the sound is muffled pretty bad.
I have recently switched to a pair of the latest version, AirPods 3 (with the shorter stems) and they seem to be made better in general. No sound problems and they seem to stay cleaner with minimal regular cleaning. I use a toothpick to gently remove any buildup as needed. The fit of the 3s is significantly different that the older version and did require some getting used to. They are a bit larger in the ear.