PBE problems

So i gained access to the PBE, and i downloaded the new client but didn't play on it at all. So yesterday i finally began playing on the PBE and i've played 2 games so far, both of which ceased to work. My issue is that i understand the PBE its supposed to be super stable, but if its throwing me out of each game i play, then what is the point of using the PBE at all?