I found workaround for this case, at least in my home. Go to Wifi Setting, and set DNS from Automatic to Manual. I removed default DNS server given from my router, and then add Google DNS 8.8.8.8 and 8.8.4.4. Voila, the problem seems fixed. Anyway, I believe this is not permanent solution, and I thinks not everyone iOS users understand such this technical workaround. If this is your case, maybe you can try.... hopefully it's help.

Just update to iOS 14.2 today. I got the same proble, and can't get any way to solve this issue. What I have tried : Reset Network Settings Set Private Address to Off Forget Network and re-join Hard reset all above still not fix my problem, When I restart wifi, then the data will come in several minutes, but after that.... freeze. any other workaround for this problem ??