Plutonium

Hello, these last days i've been playing bo2 multiplayer like a fresh new player but every time i relaunch my game im losing progression. For example i played 2 hours ish, i got to level 39 got my first golden weapon but when i relaunched my game i lost everything and im back to level 30 and lost my gold DSR. I don't want to lose my progression again and again randomly when i leave the game and its also happening in zombies i lose my rank and i have to grind it again. Did anyone ever got this bug and can help me with it

Thank in advance and have a nice day.
(Yes i know i can unlock all for multiplayer)

Thank you for the answer i'll try it !

Hello, i've been playing for a few days and most of the time when i try to join a server (multiplayer and zombies but mostly in multiplayer) my game freeze and lags out i need to open task manager and relaunch the game it keeps happening i need to try 5 time ish for it not to freeze and crash can anyone help me ?

Thank you.