Diagnosis
Intermittent cutouts across all inputs points to a system-level issue, not a single bad connection. The most likely culprit is wireless interference with the subwoofer.
How to Fix It
The subwoofer uses a 2.4GHz wireless link, which is crowded. First, move any cordless phones, Wi-Fi routers, or microwave ovens away from the sub and soundbar. If the sub is tucked behind a metal rack or TV stand, move it to a more open location. Even a few feet can make a difference.
If That Didn't Work
There's a known issue with certain Wi-Fi channels causing conflict. Try changing your home Wi-Fi router's broadcast channel to 1, 6, or 11 (avoid auto channel selection) to see if the dropouts stop.
Heads Up
If the dropouts are exactly every 10 seconds, that's a different problem—usually a handshake issue with the TV's audio format. Try setting the TV output to straight PCM.