I was in a stadium game and I got kicked out for no real reason

Title. I was playing stadium with a bunch of friends of mine and I admit, I wandered off (away from the fight) to try and spot targets (as Soldier).

I guess I must've wandered too far that the game gave me a timer to not be inactive (to be kicked for inactivity) and I got kicked. When I got the notification on my HUD, I immediately went back to the fight and was about to land a shot, only to get kicked out of the game.

My endorsement level might've taken a hit too since quitting games is not good at all. But once again, I got automatically kicked and went as far to rejoin the fight, aiding my team.

Does anybody know what happened? Like, what're the mechanics at play there?