Hi, sorry to hear that!
What version of the engine are you using, and where are you saving your project?
Does it happen immediately if you create a new project, save it, close the editor, then load it again?
I'm aware of an issue where some people have had their project become corrupt after a power failure or system crash. Did you experience either of those?
Viewing post in editor keeps crashing
this happens both in the development build and 1.10.5, when trying to open my project after some time, the .dats get corrupted and all data is lost, it does not happen immediately, it seems random, by which i mean it can randomly happen when trying to open my project, not always, sometimes. i havent had power failures or system crashes too