This needs more specifics. Such as when and where if at all are you in the game. Is it when launching the game. what have you done to resolve the issue. Just saying repeatedly doesn't help to help you resolve your issue.
A little over a year ago I was having the same issue. With almost every map change I would lose connection. Turned out that my modem/router was the cause. After updating my modem with my ISP I haven't had any issues.
Now, I'm not saying this is what you are dealing with but it might be something to check into.
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Now, I'm not saying this is what you are dealing with but it might be something to check into.