Can you provide a list of the 404 errors? I'm aware of one post made that linked to a 404 from our prior documentation. If you've been receiving 404 errors, having a list of those you've seen would be extremely helpful. Specifics are always helpful of course
I'm not really seeing any 404's anywhere on the forum community like your described.
Other than maybe running into an obscure outdated link perhaps somewhere posted on the forums, you might want to check your computer for spyware, viruses, or software updates for your web browser and plugins.