Are you asking about the Broadcastify feed here or are you local to that tower and not receiving any traffic on a real scanner or radio?
If you are referring to the Broadcastify feed, remember that these feeds / Calls nodes are provided by volunteers, and often times run on whatever available hardware someone has laying around. Things happen. I am not sure what software or hardware that site uses, but if they use SDRTrunk like I do, there was a reasonably big update to that software in recent weeks that people are upgrading to. What should have been a simple 10 minute downtime of my node when I upgraded yesterday turned into almost an hour and a half of reboots, software restarts, moving USB dongles and readjusting before everything came back up behaving normally.
Always assume normal gremlins and have grace that when they happen, for most volunteers here, the time, ambition and cash to get things back online is usually a much lower priority than other things in life.