Wow51900319 error

Hello blizzard tech support,

I’ve been having this error code and it’s been lasting for a month now. Everyday I get kicked out from the blue for absolutely no reason, in every character I try to log in.
I don’t know what to do, since my internet connection is pretty fine, except for the game itself that just do not run properly.

I sincerely wait for some kind of solution about this…

Thank you!