I was playing halo 5 swat and my batteries died so I went to go get more and I come back to inactivity message and now it says I am banned from halo 5 Guardians
There is a ban thread in the halo 5 support section, have a go there.
The ban has just been lifted
If you have any other queries about matchmaking bans, please refer to the ban thread, noted above, in the Halo 5 support forums. Thansk 