Today, I experienced a brief disruption to my internet connectivity around 11:30am. I've heard at least one anecdotal report that others who use Bell or Rogers had a similar issue.

At around 12:00 noon, I unplugged my internet modem and then plugged it back in and the issue appears have resolved itself.

Issues like this one can be caused by unexpected resets in the internet service provider's networking equipment. For example, if the ISP's DHCP Server experiences issues and forgets all previous DHCP lease requests, it may be necessary to reboot the client's networking equipment (their router/modem) in order to trigger a new DHCP lease request. Otherwise, you'd have to wait up to ~48 hours for the client's DHCP lease request to expire and update naturally. (This is just one of hundreds of possible explanations, I never investigated the actual root cause, but now that it's fixed I don't care)