Just discovered this bug. Matchmaking was taking a while to find players so I mindlessly started to mash the X button, causing the app to crash and kick me to the home page.
I tested it twice more to be sure, and it seems to be a consistent phenomenon.
Only a minor bug, but it’s a sign of instability that should be smoothed out for final release.
Originally posted on /r/halo (http://www.reddit.com/r/halo/comments/2r7tsr/h5_beta_bug_repeatedly_bringing_up_the_roster/)
A user noted that it crashed his entire Xbox, so it may be more serious than first thought. I’d appreciate if more people could test this out and post their results!