My bunny is a little over 2 months old, I've had him for a little over a month and I thought he was litter training well. I let him out to play for about 2 hours a day and he wasn't pooping or peeing anywhere but in the litter box in the cage, everything was fine for like 3 weeks and then he suddenly started pooping and peeing in two corners in the area I let him out in to play in. It's only in the corner so I don't think anything is physically wrong with him, I just can't figure out why he's started misbehaving. Any suggestions?