Teamspeak 3 Server Issue-After short paket lost of 100 the Client cannot hear anybody

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Hello to all, i have a problem with one Client: All is working fine, only one person has this problem. He joines the server, after 3-5 Minutes he has a packet lost of 100 % and after that, he cannot hear the whole TS. I tried with him: He pinged my server permanent, all OK, ping is good. I... Teamspeak 3 Server Issue-After short paket lost of 100 the Client cannot hear anybody