I have never been suspicious. I just played the game normally, but I don't know why it was stopped due to suspicious statistics. Find out

https://battlelog.battlefield.com/bf4/profile/edit/edit-soldiers/

Did you ever join a server and trade kills with a friend to unlock guns?

I've played with a friend, but I did it fairly.

Looking at your statistics it looks like kill trading.

We will lift your ban for now.