Resolving Samsung TV HDMI ARC failures, which often result from interrupted handshakes, typically requires a cold boot by unplugging both the TV and soundbar for 60 seconds. Additional fixes include verifying cable connections, enabling Anynet+ (HDMI-CEC), and updating firmware to resolve potential conflicts. For detailed, step-by-step troubleshooting, visit Samsung Support . Arc stopped working on Samsung TV - Sonos Community