Bot gets OP_CODE 4003 after starting the VoiceClient

[craftundfun]

$discord->joinVoiceChannel($channel)->done(function () use ($discord, $message, $em) {
			$voice = $discord->getVoiceClient(GuildId::GUILD_KVGG);`

			if ($voice === null) {
				return;
			}

			// 12 ist die Anzahl von zeichen '!sound play'
			$name = substr($message->content, 12);

			$sound = $em->getRepository(Sound::class)->findOneBy([
				'name' => $name,
				'deletedAt' => null,
			]);

			if ($sound === null) {
				$message->reply('Dieser Sound existiert nicht');
			}

			$filename = $sound->getFilename() . '.' . $sound->getFileType();
			$path = $this->filepath . '/' . $filename;



			$voice->setMuteDeaf(false, false);

			echo 'Spiele: ' . $sound->getName();

			$message->reply('Spiele Sound: ' . $sound->getName());
			$voice->setVolume(100);
                        $voice->start();

			$voice->playRawStream(fopen($path, 'r'))->done(function () use ($voice) {
				echo 'test';

				$voice->close();
			});

			$sound->setLastPlayedAt(new \DateTime());

			$em->persist($sound);
			$em->flush($sound);
		});
}

My bot joins the voicechannel and everything works fine until I start it with "voice->start()". After that it loses the connection with 4003. I don´t know why that happens and how I can identify the bot first before playing a mp3.

[key2peace]

lass das $voice->start() mal wech, auch setVolume brauchste nicht (100 ist standard), und setMuteDeaf brauchste auch nicht :)
ausserdem, ne mp3 ist kein rawStream sondern ein mp3 encoded file, stattdessen benutzt du $voice->playFile($path) der dan die mp3 decodiert und umsetzt in OPUS, was discord 'hören' will ;)