Unreal Freezing all the time

When I try and open a new level it freezes. Sometimes my navigation around a level works fine and sometimes the freezing happens again. Also when I try and save or just close it down it freezes so I have to close it via the task manager. It’s so bad I just can’t use it.
My PC spec: AMD Ryzen 9 3900X 12 core, 128GB RAM, GeForce RTX 2080 Ti X2.