404 error

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Hello friends, after the recent internet outage, I have been experiencing intermittent 404 errors on my websites. For example, on one website, I receive a 404 error after clicking on 2-3 pages, starting with the 4th page, including the homepage and other links. Both WordPress and XenForo platforms are generating the same error. I would appreciate any help from those who have experienced or dealt with this issue.