iOS16 Network issues on mobile devices

Affected devices: iPhone 14, iPhone 12, iPhone 11 & iPhone 8

Issue start: Late October 2022

Issue end: still persisting

Late October started this issue with network on our mobile devices. Both on WiFi (multiple WiFis) and cellular data. Multiple applications has been affected, but other applications are working fine.

Multiple apps has been affected (both Apple apps and third-party). The applications are buffering and not being able to continue inside tha app, we can open the application but not continue inside the app since it's buffering.

Some apps stops working, but other applications are working fine. The most affected applications are Safari, AppStore, Bank applications (Swedbank, SEB, Handelsbanken), H&M. Teams, Outlook and other Microsoft applications are working fine.

Troubleshooting steps made:

1. Restart iPhone - issue resolves for a few hours, the issue comes back again
2. Reset Networksettings - issue resolves for 1-2 weeks, the issue comes back again
3. Factory reset from iTunes - issue resolves for 1-2 seeks, the issue comes back again

This issue seems to have started with the new iOS16 version.

Question for Community

1. Is there any other troubleshooting steps I can try?
2. Does this have to do with the DNS on multiple affected devices?
3. Changing the DNS settings to manual, is the a DNS I can try?
4. Is this a known issue, CP37?