I'm one of those poor bastards that constantly, by this I mean multiple times daily, gets this frustrating popup telling me about corrupted files. I can do simple tasks like start fishing or processing but nothing else as NPCs and monsters vanish, I can't interact with mounts, and if I try to swap characters I can't even interact with the invisible NPCs. The common trend seems to be event areas. When standing outside of Calpheon City's north gate, for example, I can go as far south as the marketplace near the northern stable and be fine. The moment I go further south and city assets are drawn, I get the popup. This is also true of Velia and Heidel. My characters in the desert, Shakatu, and ocean never get prompted by the corrupted file popup.