Black Ops 3 has royally screwed me

[FIT_Gamer]

ArchangelMadzz said:

I played for about 3 hours yesterday, going for dark matter camo getting headshots on my pistols.

I logged on today to find all that progress that day has been reset, BUT I still have Long barrel on my MR6 which is a level 3 gun and you need level 11 for long barrel. 

Has this happened to any of you? Do they think I've cheated or what?

Similar happened to me but it was only around 5 games worth of progress, so i wasn't that bothered. Just had to redo Long shots and and Bloodthirsty kills with XR2. Dark Matter is pretty easy though. If you grind only take you about 5 days, actual days, not playtime.