ok so ive lost 40 levels at 1 time and several other time 20 to 30 levels. i found a way to make sure you dont loose anymore rank.

go to my youtube channel it will show you exactly how to make sure you dont loose anymore rank.

youtube- search for foxracerjj (my channel)

or search youtube for[ how to save your levels in mw3 ] the person that posted it was foxracerjj