Gears Of War 3, reset my progress

I was playing splitscreen co-op with my son and  2 other players online and we stopped playing for dinner. When we came back my story progress and all my achievement progress for locked achievements was reset to zero, his was fine though. What happened, how do I get my stuff back? I've seen a lot of people on the GOW forums with the same problem but no solution.

 

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Last updated July 4, 2018 Views 5 Applies to: