Looks like a system outage. My station is showing zero tracks and a quick review of other users stations are showing a sharp drop in reported tracks in the last hour. ~0900 est.
Is there a site or resource where system outages are reported? The flightaware twitter feed is silent so far.
I don’t see any problems on our side. It’s normal for the stats for the most recent hour to appear to be low (because that is the hour that is still in progress).
This problem seems to be specific to your site, your dongle has gone deaf for some reason, either a dongle failure or an antenna / feedline problem.