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Having the same issue. I keep unlocking gold for my mp7 and losing my progress 
I tried the setting change strategy in this thread: https://forum.plutonium.pw/topic/34787/online-progress-not-saving-i-think-i-solved-this-problem
But it didn't work for me. Maybe it will work for you.
So I've had a bit more luck with settings changes, but it seems to only work for me when I actually look at the weapon's new levels or camos in create a class before changing a setting. Even then, it doesn't always work (just had like 5 camos worth of progress not save)