hello sounds like you might have a memory leak or a possible corrupted file maybe you have multiple of the same files or accidently have archiving on which is a great thing to have on but sometimes it will archive files and maybe you forgot that you had it on and maybe since you said its been a year it would make sense your version of unreal engine is have you tryed reseting your computer or removing all traces of unreal and any duplicated files because if you have duplicated files thats a potential memory leak which will sometimes throw all types of errors that are unexpected do you have the latest driver update for your graphics card.