404 error

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Hello friends, after the recent internet outage, I have been experiencing 404 errors intermittently on my websites. For example, on one site, after clicking on 2-3 pages, I receive a 404 error on the 4th page, including other links like the homepage. Both WordPress and Xenforo platforms are showing the same error. I would appreciate any help or advice from those who have experienced or know how to troubleshoot this issue.