We are actively investigating issues impacting players' ability to sign in to Destiny on all platforms. Until resolved, players may experience disconnects or be unable to sign in.
If you're tired of playing the same thing all the time, I've set up a website for people who want to play custom games. You can see what games are playing at what times, submit maps and gametypes for future play, and register to host custom games for others. Check it out at: http://halocustomgamesnetwork.weebly.com/