Hi unwat ,
thanks for chiming in and for your suggestion, I appreciate it!
I've gone ahead and set the home wifi as "unmetered" as you suggested (it was set to "detect automatically"), so we'll see if that was the problem.
The other settings were already as you suggested.
GrapheneOS , Play definitely is the installer of all apps that I downloaded since that's where I downloaded and installed them from.
However, I'm not sure about the notification settings you mentioned, so can you please tell me where I can find and double check the "notifications from our compatibility layer" ?
Thank you so much!