I also see the same issue in all computers in the green zone that are pointing to google DNS servers. What is also notable is that the IP fire beeps the mini PC sound alarm as if has lost internet connections to the cable modem side to the ISP. I can see this issue recurrently almost every few minutes apart. When IPFire is taken out of the network path all works fine so no internet related issues. I have some suspicion also in two areas one is IPS but disabling it did not change anything and another area is the geolocation based blocking which could be related for video type streams based on services around the world. I use the geo based filtering to isolate inbound VoIP calls but it may have broader impacts. I will also disable that and try again.