Potty training – what am I doing wrong?

Hi everyone, I’d love to hear your thoughts on this.

We have a 5-month-old English Setter (almost 6), and here’s his current routine:

7:00 am – walk outside 8:30 am – first meal 10:30 am – walk outside 12:30 pm – second meal, and a walk about 15 minutes later 2:30 pm – walk outside 4:30 pm – walk outside 7:30 pm – last meal, and a walk about 15 minutes later 9:30 pm – last walk of the day

However, we’re having a lot of accidents. When we wake up, he has peed and pooped everywhere — a lot of it! (Inside his playpen)

He’s allowed to roam only in the living room. He also has a playpen where he naps when he can’t settle on his own, and at night he sleeps there with his bed, water, and a pee pad for nighttime accidents. But the accidents are happening every day, and we’re not sure exactly when — maybe around 5 or 6 in the morning. He also sometimes pees in random spots around the house, as if he thinks it’s okay.

Basically, there’s usually one accident during the day and one every night when we let him out of the pen.

P.S. We always reward him with treats and praise when he goes potty outside. Please help us figure out if we’re doing something wrong. Thank you so much