One other reason not mentioned is to maximise the amount of time the router is off. Large ISPs back in the day would assign an IP address from a specific pool. This pool would change occasionally and the IP wouldn’t update automatically if the user stayed connected. Disconnecting for 5-10 minutes would allow the router to obtain a more current IP address that would offer less congestion. These days they don’t really give out these IP addresses so it’s less of an issue. However it’s still part of the diagnostic process with CS reps.
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