I'm playing on PS3. To the best of my knowledge, I'm playing with the most recent patch. I mean, pretty sure I'd have to actively try and avoid it to stop that from happening.
So, anyways, I'm playing the game on hard mage, get like 30 hours in the restart because I didn't end up getting the storyline choices I wanted from the Dragon Age Keep (a website which basically lets you choose story options from previous games.) Don't think I ever ran into the game freezing. Maybe the odd time but I don't remember, so if it did happen, it wasn't a lot.
It's on my new file on casual mode that I've started seeing this problem occur. I find that very strange. (Also I'm playing on casual until I catch back up to where I was with my old file. I had just moved the inquisition out of their first base into the 2nd one, so it's very nice that I've got a very specific objective where I can say "now I've caught up.")
Oh except now I'm doing stuff in the Hinterlands I didn't do in the first place. Whoops lol. Oh well.