I'm here to second this. So far so good. EVERY autosave automatically corrupts at this point, but I haven't seen any of my manual saves corrupt after adopting the practice of occasionally making a new "Save as" and deleting some of the older ones.
So I have tested this all day yesterday and I am happy to report some success!
The steps I took incase anyone is interested;
Went to ps4 storage and removed the corrupted save files, leaving ikly my most recent save file (not needed if starting a new game)
Switched off auto save in options, and as you advised have only been using save as, and deleting any old saves I create.
Have been able to play pretty normally, I've had a couple of crashes which helped me learn to save as all the time - which still isn't great.
Once again thanks for the help!