What do I do if my 3 almost 4 year old continues to pee himself after knowing what he’s doing?

I’m so frustrated at this point. He’s been potty trained for 3 years now. He’s never peer himself before up until maybe 2 months ago. Now it’s been consistent. He doesn’t have any bladder problems, actually no problems at all. I have an 8 pm cut out time so after that he can’t drink any liquids so he doesn’t pee himself 🤦🏻‍♀️

But yes lately he’s been peeing himself, at least twice to 3 times a day. And mentally I can’t handle this! I don’t know what his problem is! The part that really frustrates me is that he knows what he does cause he acts suspicious and very quiet when he does do it.

Even yesterday, he was playing outside and he casually peed himself and continued to play, normally he tells me he has to go to the bathroom. But lately he hasn’t, he just takes it upon himself to pee his pants. I don’t know what to do! I understand accidents, but to be doing this consistently? I don’t know why he’s doing this! Is this a behavior issue? I dont understand!