So around the tail end of my session yesterday, around 3 am, EST, one of my players in a Pathfinder 1e game just started saying his sheet was "gone." At first, I was confused, because it was right there, but upon opening it, I realized that all his stats were dropped to 10, his class and all information connected had been pulled, and his skills were all reset, though it still said 95/95 at the bottom, for some reason. We refreshed to no avail, reset the game entirely, nothing worked. Now, about 12 hours later, nothing has changed, so I'm inclined to believe the sheet is suffering some more major problem. The feats, items, and defensive equipment are untouched, but don't seem to be interacting with his AC at all. The whole sheet, for lack of a better explanation, has stopped functioning entirely. I could remake his whole character on another sheet for him, and have already started to copy over relevant information, but in the interest of not letting this happen twice, I'd like to try and find out why this happened and how to prevent it in the future. Anyone have similar experiences or any idea what happened?