It’s possible you’ve been unlucky with hosts that have had connectivity issues and disconnected themselves. I’d say this is likely if you are only occasionally disconnecting from host, and not something like every other game.
You mention using 4G - is this a WiFi or mobile data connection? Is it possible to switch to a wired connection if so? As this is recommended for the most stable experience.
I appreciate you’ve tried solutions from the FAQ article already - but to confirm, have you ensured your Download Region is set to a nearby location?