I am playing with a bluray disk. I haven't started many quests. Just been having fun in build mode in Sanctuary. I was experiencing semi-frequent game crashes yesterday before turning off my PS4's network connection at the advice of another forum. This seemed to reduce the crashes at the time being, but could have been coincidental. Today I added a lot of things to my town. Including a wall, a basketball court, and a guard barracks. After several uninterrupted hours of play the game started crashing again. The crashes grew more and more frequent. I gave my PS4 a rest for about an hour, and tried again only to have it crash twice more almost immediately after loading my save file. Could it be that I have too many items placed? I used a lot of small wooden panels for patching holes and covering misalignments.
Fun game ... Hope to be able to play it soon again.