He is still very young. Jaxx didn't quit having accidents until he was six months. I personally would get rid of the mat inside because it could be confusing him. I would probably walk him a little longer on his walks to make sure he has done all of his business outside. If Jaxx was going that much I would probably take him to the vet just to make sure it wasn't a medical issue.
It will click it just takes time, patience, and a lot of routine, routine, routine.
Any time you take him out of his crate he should be taken directly outside. Same thing after meals, playtime, and naps.
The first six months with Jaxx it seemed like I was taking him out to potty more than anything else but in the long run training now is worth it later.
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