Diagnosis
Wireless interference is breaking the proprietary 2.4GHz signal between the soundbar and sub. Common culprits are Wi-Fi routers, baby monitors, or microwaves.
How to Fix It
Reposition the subwoofer. Distance and obstacles matter less than interference.
1. Move your Wi-Fi router at least 3 feet away from both the soundbar and the subwoofer.
2. Place the subwoofer in front of your TV stand, in direct line-of-sight with the soundbar, even if it's not ideal for room aesthetics.
3. Plug the soundbar and subwoofer into power outlets on the same wall circuit if possible.
4. Once in the new spot, press and hold the 'Connect' button on the back of the subwoofer for 3 seconds, then do the same on the back of the soundbar. Wait for the solid green light.
If That Didn't Work
There might be a firmware issue. Update the soundbar's firmware via the Yamaha Sound Bar Controller app on your phone. A firmware update specifically addressed early wireless stability bugs.
Heads Up
The subwoofer has a 30-minute auto-standby. If you're watching content with very low bass for a half-hour, it will sleep. Playing any audio with normal bass will wake it up; this is normal, not a disconnection.