A few of my apps tend to "lose" internet connection and it's mostly noticable for me on YouTube, LinkedIn, Discord. When I open the app, it's always on the loading state and nothing moves further. Sometimes apps crash and that's it.
This happens from time to time, whether it's connected on 4G or WiFi. Lately it's been happenning 1-2 times per app, per week. Connection works fine, if I immediately launch Samsung Internet I verify that it's up and running.
What does not help:
Clearing app's storage
Rebooting the phone
The only thing that works is to uninstall the app (or revert it to stock if not possible) and then install it again.
I think this began after the update with Deep sleep etc.