So ...:
-- There was no four-hour outage?
-- There were two very brief outages, one at 7:00 and the other at 11:00, and DavidZ just happened to tune in for both?
-- There was a four-hour outage and either (a) nobody was listening, (b) nobody cared, (c) people noticed, but didn't care enough to post about it on social media, or (d) people noticed, waited for a few seconds to see if the signal would come back, then either switched the station or turned off the radio?