This problem has come back but now it says unable to connect to the halo 5 servers.
Having the same issue. Purchased the game a week ago, and the warzone server drops me once every 5 games.
Server issues can be reported here: https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/server-reports-latency-disconnects-etc/94237e5e-3dba-4a03-b2bd-670defa11329/posts
Please read the OP and respond accordingly, thanks!