i got a un72 bb used, in good condition and installed it in my new ride. it seemed fine at first, but now it has a huge amount of play going on. so much so that i can't trackstand at all anymore. it seriously feels like a full inch of play at the pedals, though i'm sure it is only a mm or so in the bb itself.
is this common? is there a way to fix it? should i just get a new one?