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I have no idea what has happened but I'm freaking out on an assessment i have to submit soon.

Everything was fine and then randomly the graphics deleted on certain sections. In the preview it has weird error colours as well. There was no history to go back onto either. This happened to another file but now it seems to be fine. Is it my computer or the file corrupted. I dragged a image of google images directly into the file but it didn't work properly so i just deleted it and since then part of the walls and floor have been deleted.

Please let me know if there is anything i can do to fix this.