I also have this problem with getting disconnected from every server. I tried uninstalling punkbuster from bf4, but then i got a different error (the same as the person above). I tried reinstalling via punkbuster.com and it still gave me that error. What i thought was weird was that when you add BF4 to PB, it puts PB in the BF4 folder, but when i uninstalled it, it was in a subfolder called _installer>punkbuster>redist. I installed to this folder, and it removes the error message, but i still get the error, disconnected from server. This leads me to think it isn't a punkbuster error at all or atleast one that is fixed by reinstalling it. This error started randomly one day. I didn't update or change anything. BF4 is up to date and so is punkbuster.
