Why Is My Progress is Gone?

I just logged into the game and I was doing a legendary run of the game and all my progress was erased. My rank is also back down to 1 when I was 29, yet I still have my stats available from previous matches. Not sure if it’s related but I also had my reach campaign stats erased as well and my armour was reset, my rank was fine (not first time it’s happened on reach and it’s fine now). I know it wasn’t accidently erased by someone else because I’m the only one who plays on my xbox. I’m just wondering if there is a system error or whatever is going on?

EDIT: My xbox crashed so I had to restart it, pulled the power cord out and everything is good now!

Glad it all worked out mate. If you turn your xbox off before quitting this title, the game occasionally forgets your saved settings. I’m constantly having to turn all hp bars back on :confused:
Better that though than what you described.