Little Yellow Book/Bumper to Bumper - S9-E4
Continuity mistake: In "Bumper to Bumper", Mrs. Puff gets out of the boat and asks Spongebob to switch seats with her, and Spongebob is wearing his seat belt. In the next shot, once she has made her way around the boat to the side where Spongebob is sitting, he is no longer wearing his seat belt.
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 ★