Rodeo Daze/Gary in Love - S7-E15
Continuity mistake: At the end of Rodeo Daze, the bullfrog bursts the bubble and everything lands on the ground in its "real" state, except there's no Squidward. We are told he's an octopus, so he wouldn't be one of the fishes that we see.
Chosen answer: You need to provide a little bit more information to be able to answer a question like this. In what region is it not being shown? I see it being replayed here in Australia fairly frequently. As for a general reason, there does not appear to be any for why it specifically might have been taken off the air in any country or region. Like any show certain episodes can sometimes not be replayed for long periods for unknown reasons.
Lummie ★