Game keeps freezing (Mass Effect 3 PS3)

Your lucky you even got that far, I only to get to the part  when you meet up and talk to  Bailey. During that conversation  the audio cuts out,but they keep talking because the subtitle are still happening.  After they are done speaking, silently to each other and I try to play and nothing will load, I get to watch a green circle on a door go round , I did get though once to one section before another freeze,after two minutes. THis has also cause my playstation to shutdown, inproperly twice having to do a self scan on it self.  I also just downloaded all three single player dlc to last month,  both omega and leviathan played just fine, of course I haven't had a chance to play citadel, not sure if something is wrong with that or not. 

I am trying a reboot, deleted all patches and dlc, and reloading them, which is taking some time to see if that corrects anything, but it just annoying cause I have already in the past beat this game twice which no problems. 

I just hope the problem isn't because of the Citadel, I have been looking forward to finally having a change to play it and spend some new time and conversation with garrus and the rest of the crew.