I will reuse this thread, as I have quite similar problem.
Since two days my Internet connection is constantly interrupting. It looks like DNS lookups failures but checking my internal router logs (on OpenWRT) - those are correct, names are properly resolved.
When connecting directly to ConnectBox over WiFi - the same problems - sometimes I need to reload pages with Ctrl+R several times - at least 3 or 4. Then there is a connection and works for some time. After some another time - like browsing a web shop and scrolling down the page - loading stalls again, mostly breaking the access. Or some photos are not loaded. So several consecutive requests do not work, then they work again, then disconnect.
I cannot connect to any “time critical” services like banks or XBox account. They just fail to login when there are any issues with the Internet connection.
Checked same browser, same web pages over cellular - works perfectly fine.
The issue applies both to WiFi and LAN with Connect Box, though LAN I have connected through my secondary internal router. Anyway until ca. last Tuesday (20.06.2022) everything worked perfectly.
One thing more - Home Office over Citrix works fine, but it has reconnecting options built-in. And mostly fixed IPs (so maybe DNS, again?). Tried to put 184.108.40.206 and 220.127.116.11 as DNS - but still interruptions persist.
Any ideas? PLZ 8105 Watt if it would help