The game drop out me from the game at the boss fight of the grandmaster nightfall. There wasn't any server maintenance or these, the game drop the whole fireteam out of the game.
It happens a lot in order to increase your playtime. They kicked me out of a gambit match the other day at the boss phase. It's explicitly why bungo refuses to get dedicated servers - way fewer disconnects, more completed activities... they're way more stable than some Wi-Fi player in Bangladesh they pick as host.