Halo 5 Custom games player count and ending round

I host alot of socials on halo 5 and there two big problems i experience almost every time

Ending rounds
When i go afk to do something while waiting for people to join the game will end the round even though i turned rounds off and it messes uo the whole map all doors all spawns i would have to end the game and start it up again

Player Count
Sometimes when i start socials i put the max player count to 16 but it will change to 8

How do i fix these problems?