This is the first thing to check, and it decides everything else that follows. Switch to a different channel, watch and listen for a moment, then switch back to the one that had no sound. If sound comes back on the second channel but the original one stays silent, the fault sits on that one stream, not your setup, your device, or your account. If every channel you try comes up silent, the app itself has lost its audio state, which is a completely different fix. Don't touch any device settings or restart anything until you've run this one test, because it rules out roughly half of the possible causes in under ten seconds and points you straight at the right fix.

When video plays normally but one specific channel stays silent, that channel's stream is usually carrying an audio track your player can't decode, even though its video track decodes just fine. Video and audio travel as separate tracks inside the same feed, so one can fail while the other keeps working without any error message showing up. If your player app offers a way to switch audio tracks, try that first. If it doesn't, test the exact same channel in a different player app on the same device. If sound returns there, you've confirmed it's a decoding mismatch tied to that stream, not a dead channel or a fault with your account.

If sound has gone quiet across the whole app, not just one channel, and your device's volume is clearly fine, the app's audio decoder has most likely gotten stuck mid-session. Repeated channel switching is the most common trigger for this, because the decoder doesn't always reinitialize cleanly between one stream and the next. A device restart usually won't fix this, because the fault lives inside the app's own process, not the operating system underneath it. Force-close the app completely, not just back out of it with the remote, and reopen it fresh. That clears the stuck decoder state in most cases and brings sound back on the very next channel you try.

If restarting the app doesn't bring sound back on any channel, check your device's audio output setting next. Many streaming devices default to passing surround formats straight through to your TV or soundbar instead of converting them. If that TV or soundbar doesn't support the exact format being passed through, it drops the audio entirely instead of falling back to something simpler, so you end up with a completely silent stream and a perfectly normal picture. Switching the output setting from passthrough or bitstream to stereo or PCM forces the device to convert the audio itself before sending it out, which resolves this in most cases within a minute or two.

Some buffering and playback faults are simply oversold server capacity on the provider's side, and no device setting you change will ever touch that. Sound loss specifically is rarely provider-side, but if it's happening across every app and every device you own at the same time, it's worth asking what uptime the service you're paying for actually guarantees in writing. IP4KTV publishes 99.99% uptime, which works out to roughly 53 minutes of downtime a year, and backs its plans with a 7-day money-back window so a bad first week testing your setup doesn't lock you into anything long term.