Same issue experienced on my SM-G998B (Galaxy S21 Ultra 5G).
Many connection issues with "No service" and "Emergency calls only" in an area where network coverage usually is 3 bars out of 4 with 5G coverage.
Side by side with another Samsung (not update) but with same carrier has no issues connecting/navigating to/with mobile data or wifi.
Already done. It doesn't solve the issue
iam having the same problem too, my device is A52 but other device is working properly using my wifi connection
Same problem here, on s21 😬
Wifi is online and it just doesn't work connections time out. Wifi comes back within a min or two but phone does not say wifi is off in that time.
Have this same issue as well on my S22 ultra - tried various things to resolve but it occurs on different SSIDs, both 2.4 and 5.0 GHz, app cache clears, forgetting networks and re-adding, and after rebooting. Apps using location work just fine on mobile data for me too...
Actually I tried everything, but the only thing that worked was flashing an older firmware on my Asus router. But now I have no problems. So if the problem is the phone or the router or a mix for me is a good question.