Well, reading through all these experiences players are having with the freeze issue, I can't find any real common thread except that the issue seems to occur on the new map, yet not in Arenas. Some people have new or at least somewhat up to date systems, others are on older hardware; some play through Steam, others use Origin; some have updated their gpu driver, others are still on older versions...and so on.
This all leads me to believe that it most probably is an issue on Respawn's/EA's side and very probably related to the new map. The saddest thing is that they haven't even acknowledged the issue - a simple "we've seen that there is an issue with the game freezing, we're looking into it" would be highly appreciated, so that we at least know that they are aware of and trying to resolve the issue.