My four-year-old male cat jumped into the litter box a couple of weeks ago. He looked like he was peeing, but jumped out about a minute later without doing anything and not scratching the sides of the box like normal. I didn't think too much of it because he went back and did his business about an hour later. I noticed that he did the same thing last night and then again this morning. Both times, he went back in about a half-hour later and did his business like normal. He has a water fountain, eats wet food and only gets a few pieces of dried food at night for his teeth. Should I be worried? He did have some urinary issues when he was a kitten, but it never became a blockage. He's eating normally.