My sound bar has been working fine for years but just stopped working. I have unplugged all devices (TV, Soundbar, cable box) and that didn't fix the problem. Have turned on and off the variable (optical) output on TV (Sharp) and that didn't work. Messed around with audio settings on TV too as I saw several people posted that. Updated to latest Sonos software. Checked optical cable and red light is coming out. Not sure what else to try.