Continuity mistake: After going through the curvy air ducts, Mr. Krabs, Spongebob, Squidward and Patrick land in a metal box. In the next shot, Mr. Krabs picks up a Krabby Patty wrapper that wasn't previously there.
Continuity mistake: Patrick smashes a walkie-talkie that Squidward is holding. In a few shots, the smashed pieces that were on the ground have disappeared.
Continuity mistake: Patchy the Pirate wakes up surrounded by other people in the green room. Lincoln lifts up his hat to reveal a Spongebob plush, and Patchy points at it while lying on the floor. In the next shot, his arm is now at his side.
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 ★