Welcome to the Chum Bucket / Frankendoodle - S3-E2
Audio problem: The first time the man yells in "Frankendoodle", his mouth isn't in sync.
Nasty Patty / The Idiot Box - S3-E4
Audio problem: When SpongeBob and Patrick give Squidward the T.V, Squid's mouth doesn't move when he says "Oh boy, oh boy, oh boy!"
Wet Painters / Krusty Krab Training Video - S3-E9
Audio problem: When Mr. Krabs comes back to his house, he eventually encounters a stack of 11-12? pictures, but we only hear him take 5 or so before he runs into Spongebob.
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Audio problem: At the end of "Born Again Krabs", SpongeBob is talking to The Flying Dutchman on the phone. SpongeBob's dialogue isn't in sync with his mouth.
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 ★