At home, I’m using IPv4 DNS servers, which causes problems with a new Android 10 device. With the default options, the browser and most applications which need to access the Internet just hang for about half a minute, and only then proceed with the request.
I found that I have to set APN protocol option to IPv4 in order to solve this issue. Indeed, when I set it, there are no delays any longer.
However, the phone resets the option regularly, switching back to IPv6. Essentially, I have to manually set it back to IPv4 several times per day.
Is there a way to preserve this option?