Banned after being D/C

So my mate on PC has been disconnected 2/3 times from games also going down in rank because of it and has now been banned, can someone from 343 address this maybe?
and does anyone know how long the ban is for?

new slogan for multiplayer matchmaking, Halo: Discover Cope. yes i stole that joke. but yeah, servers might be struggling, or it could be your internet. i cannot help with either. but good luck