Account not progressing: Rank, Weapon Mastery, vehicle mastery

(This problem is happening for my rank, weapon and vehicle mastery. Everything I will talk about is happening to all 3.)

When I first installed the game, everything worked normal. I’m using the M2010 ESR. I got it up to level 12-15 before the problem started happening. My Weapon Mastery stopping tracking towards my weapon, and I couldn’t level it up. However, about every 6-10 games I played, the bug would stop and I would be able to progress the mastery again, but that would only last for 1 match, maybe 2 if I was lucky before it stopped tracking again. To make matters worse, each match I join is usually about to end, so I have no time to play. That includes the matches where the bug stops happening. 

Most of the time, I’ll finally get it to start tracking again, but the match I join ends almost immediately, leaving me with little to no xp even gained. I am playing on basic All-out warfare, conquest, and breakthrough. There are no bots in my lobbies, and it is a core game mode. I have tried restarting my game several times, didn’t work. I even uninstalled and reinstalled my game, and it didn’t fix it.

If anyone has a reason for why this might’ve happened, or if you have a solution or tip, please let me know. Even if you have no idea about any of this, please comment to boost this post so it may get the attention of someone who has more information.

Thank you.