Try audio that does not depend on the internet
When a song breaks up at the far end of the room, there are at least two connections to consider. The phone may be struggling to receive the stream, or the headphones may be struggling to receive audio from the phone. Play something already downloaded to the source device. If that is smooth while streaming stutters, investigate the internet or Wi-Fi side before replacing the headphones.
Keep the volume modest during repeated tests, and start with the phone or computer close to the headphones. Check their charge level and whether another paired device is taking over the connection. A laptop receiving a call can interrupt some multi-device arrangements in ways that sound like a radio fault.
Change where the source sits
Move a phone from a bag or behind furniture onto an open surface. Then walk the same route again. Note the point at which the sound starts to fail, rather than relying on an advertised range. A clear room and a path through several walls are very different conditions, even at the same measured distance.
Try the source on the same side of your body as the headphone connection or receiver, particularly if a pocket test behaves differently from a tabletop test. Metal furniture and dense walls can make the path less forgiving. You are looking for a repeatable improvement, not a perfect position measured to the centimetre.
Consider the nearby equipment
Bluetooth shares the 2.4 GHz band with some Wi-Fi traffic and other devices. Apple identifies nearby wireless equipment and certain USB 3 or Thunderbolt 3 connections as possible interference sources. Moving a USB hub or external drive further from a wireless receiver is a practical comparison when the trouble began after a desk rearrangement.
Change one item at a time. Temporarily disconnect an unused accessory, or move the source away from a dense cluster of equipment, then play the same local audio. Do not disable household devices indiscriminately or change every router setting at once. You would lose the chance to discover what actually helped.
Compare a second source if you can
Pair the headphones with another compatible phone or computer and repeat the close-range test. Consistent trouble with one source points towards that device's settings, software or surroundings; trouble with both leaves the headphones and shared environment in the picture. Neither result proves a particular component has failed.
Check the manufacturer's support information for the exact headphones before updating software or clearing their pairing list. Forgetting and pairing again can be useful, but it will not remove a physical obstruction. Keep a note of the working arrangement once you find it, especially if moving a receiver or cable was the change that made the difference.
