After they are In use for while the fine dirt doesn’t get washed out when the pop up pops down the seal get contaminated and causes it to stick in up position. Most sticking ones you can hold the base and unscrew the top cap and the whole guts will come. Now you can get to seal and shaft to clean it. I would also look at shaft for deep scratches or groove worn. Sometimes you can scotch bite the grooves and scratches out. Or just buy the same type, Unscrew the top of the new one and put the guts in the old outer housing. That way you don’t have to dig it up to replace it.
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