Honeywell did have an outage but it was cleared reasonably quickly.
I have a WiFi Honeywell thermostat and it some times has problems reconnecting if there is interuption to the WiFi network it connects to. The first thing I do if it reports a communication problem is PING it from network tools. If that doesn't work I pop the thermostat off its base then plug it back in.
Usually this resolves the problem. The thing to remember is even if the thermostat loses its communications it does continue to run its program.
According to my router connection log, the thermostat is attempting to connect to 199.62.84.151 thru 153. The IP is owned by Alarmnet aka Honeywell. As of this entry, I am unable to ping any of the addresses. So from my perspective, H still has an issue.