His shop is always closed, what can i do now? I play on Xbox, it's a big deal?

use a different shop. i never liked him much anyway. i personally prefer the pawned prawn, I think thats its name, in riften. or the lady in markarth.

I think it happens from time to time. Usually I lockpick the door and go inside then straight back out and wait 24 hours. It usually works then.