Can confirm this is happening to me as well. I’ve read some threads such as this one: https://us.forums.blizzard.com/en/d4/t/permanently-reconnecting-to-diablo-iv/130471
It’s not a new issue, connectivity used to be fine up till the start of season 2. Now the problem is all over the place, you play half an hour maybe one hour and the problem starts “reconnecting to diablo 4” if you teleport the game disconnects you and crashes, besides the fact that all markers disappear on map. Have no connectivity issues on any other multiplayer game. Blizzard please fix your server desync issues.