the only survivng o2jam as of now is the Korea one. the last o2jam server outside Korea, PH, just shut down last sept. 30.
and i'm very sure that's korea is what he's talking about because i've also played o2jam KR and encountered the same problem (game shutting down after a few minutes or while alt-tabbing).
i still haven't found the solution for that and i think it's just o2jam KR being fags... ):
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