Problem with PAYDAY: The Heist (PS3)

I am haveing a recurring problem with PAYDAY: The Heist on PS3 and just wondered if anyone could help me out.

Every time I try to connect to an online game I get a message after a time to say that the connection to the game failed ("ERROR: Failed Joining Game") and when I try to create a online game i recieve a message to say that creating the game failed ("ERROR: Failed Creating Game"). I've been playing it since the beginning of July when it became availableon PSN+ and have installed the update (2.03 I believe) and have installed the ad-on pack too since that first installation and it has worked fine upto last night.  I have uninstalled the game and re-installed it along with the update/patch but still seem to be having the same problem.

Can anyone help me out as I was really enjoying playing this but currently all I am left with is the rather weaker single player portion of the game.