A live stream arrives as a string of small segments, roughly six seconds each, and the audio and video tracks inside each segment are supposed to stay locked together. When they don't, some of that comes from how the original source was encoded before it ever reached your line, not from your Firestick or your home network. That's why one channel can sound perfectly timed while another drifts within a minute, and why sync problems tend to show up more on some types of programming than others. Treat drift as something that can be source-specific, not a single device setting you fix once and never think about again.

Open Settings, then Display & Sounds, then Audio, and look for AV Sync Tuning. This shifts audio timing for everything the Firestick plays, not just one app, so it's the right first move if drift shows up across more than one channel or more than one player app. Nudge it in small steps and give the stream a minute to settle before judging the result, since the first few seconds after a change can still show the old timing. If this setting fixes it everywhere, you're done and don't need the app-level control at all.

If the device setting doesn't fully clear it, or only one specific channel drifts, look inside the player app's playback menu for a separate audio offset or audio delay control. Apps such as TiviMate and IPTV Smarters expose this per channel, which is exactly why it has to be reset each time you switch to a different channel with its own drift. This app-level control and the device-level one are independent; running one doesn't make the other unnecessary, and a channel that needed a nudge yesterday might not need one today if the source re-encodes.

Some drift comes from oversold server capacity, not your stick or your app, and no local setting reaches that. If a large share of channels drift the same way at the same time, that's a signal to look at the service behind the line rather than keep tuning settings on the device. This matters because a setting can mask a small drift but can't correct a server that's under strain, so repeated fiddling with the same control every few days is itself a clue. This is one reason uptime numbers matter when picking a provider: 99.99% uptime works out to about 53 minutes of downtime a year, and a service that publishes that figure is easier to hold accountable than one that doesn't say.