There is another update in the works (no ETA yet).
This isn't an isolated issue, but it also isn't very common, and was not observed during internal testing or the separate certification processes for Sony in Europe and North America. It took a couple of people providing saves, one with a detailed description of actions taken before trying to save again, in order to track down and fix that problem. There is also a separate issue still being investigated, AFAIK.
For the new game, try exiting the game and restarting after you save. Does that avoid the crash on the next save? It would be a PITA workaround, but short of waiting for the next update, would take less time than what you would loose with the crashes.