Just as a precaution, I’d run a full RAM (memory) test of your machine to make sure you don’t have a failing DIMM.
Its seem I get so far into my project which ive been working on for the better part of a year now and every once so often and now almost daily my level seem to crash when trying to open it get to around 35% then fails and I get the crash report. Ive tried using earlier back ups however I’ve had no luck even then I get the same error does it with also my small testing levels too. seem to happen after I close the engine I can sometimes get a crash error report then next time opening the project the levels seem to all fail opening