I play Minecraft on Nintendo Switch, Xbox One, and iOS. My Minecraft Bedrock Edition Realm has been constantly saying “Disconnected from server” for all players and disconnects everybody. I even put up a new world on the realm and it still does this. I think this is an issue on your side. Please fix this ASAP, and thank you.
This is happening on my Bedrock Realm as well (1.14.2) and when players log back in, they are back at the most recent back up. It happens multiple times in a row, frequently within 15-20 minute spans.