Save issue for me also on PS4!
Sim #1 - Regular Playthrough
1. Were you in live mode, build/buy mode, manage worlds or travelling when you tried to save and this started to happen?- I was in live mode and my sim was sleeping when I tried to save.
2. How many Sims did you have in your household? - 1 Sim in this household
3. What lot were you playing on? In that lot, did you have the default house/building or did you buy/build on it? - Sim 1 is living in Daisy Hovel with the default house. The only thing I have changed is the color of the furniture and the house itself.
4. Did you travel between worlds before trying to save?- Character 1 had just returned home from the Spice Festival and I had her going to bed when I tried to save my game.
Sim #2 - Vampire Playthrough
1. Were you in live mode, build/buy mode, manage worlds or travelling when you tried to save and this started to happen? - I was in live mode and my sim was in bed sleeping when I tried to save.
2. How many Sims did you have in your household? - 1 Sim in this household
3. What lot were you playing on? In that lot, did you have the default house/building or did you buy/build on it? - My Vampire is living in Widowshild Townhome and again the only thing I did was change the colors of the furniture and the house itself.
4. Did you travel between worlds before trying to save? - Character 2 had an autosave after returning from the Romance Festival played for several more hours and decided to save and play my other sim. Game acted like it was saving and then froze. Buttons weren't responding and I had to hard reset the game by closing out and going back into it. Because the game never had a hard save file and just an autosave I lost 6 hours worth of playtime on this sim because the autosave feature overwrites the previous autosave and I lost this Sim playthrough completely. The only thing that exists of this playthrough is my vampire sim and the house recoloring in my library
I am playing on PS4 and I also use a 4TB external HD to install my games on. My console has 371GB of space available on it and my external has 2TB of space available on it. On Sim #1 I only lost about 20 mins of playtime due to the autosave feature, but my Sim #2 playthrough was completely lost which was 6 hours of playtime. Both playthroughs responded the same way and acted like it was saving the game, but then froze up and there was no way to get out of the menu except to hard close the game itself and reopen it.