My 4 month old puppy has began peeing in his crate and now wont stop.

Ive had my golden retriever pup since 8 weeks old. About 3 weeks ago, he had an accident in his kennel. I didn't wake up when he first whined to go out, so he peed. I still took him out and cleaned up his mess etc. The next night no accidents. The night after he whined when he needed out, but I noticed he had already peed in his kennel, and then he didn't go potty when outside the next night i set an alram for 3 am (which is when he would be whining to go out) when my alarm went off, i got up to get him, but he had already peed in his crate. To make this worse, he began drinking it.. I immediatelystopped him, got him some water to drink (because omg gross), brought him outside, and cleaned up his kennel.​

Fast forward to now, he has now adopted a behavior ​of peeing in his crate and doesn't alert when he does it, only after. Even with me setting alarms to try and stop it. It has become consistent. I've read dogs will not go where they nest, yet he has made it a routine to do so.

I've tried taking him out at different times, waking up earlier to take him out. He's even been caught "sneaking" into his kennel to pee instead of trying to go outside.

I'm having to give him several baths a week because he's non stop peeing in his kennel. Taking the kenel away is not an option, as we tried keeping him in the bathroom, but he ended up chewing on the molding of the cabinet, and I rent.

The stressful part of this is that I got my pup to be my service dog. He does well with training, and all else, but i can't et him to shake this peeing thing.

I need help ! ​