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 ??
swardoyo
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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.