Not sure why that worked as optical digital cables do not get lossey. but hey it's something to try.
I had the drop out issue too lately and think i have fixed it . My TV is the LG 55 oled with the LG sound bar, If the problem seem to happen only with a cable signal that is a strong indication the problem is with the cable box not the TV or sound bar. My cable box is the newer 1TB Technicolor unit with Spectrum. Anyway I had it replaced recently and that is when the drop outs became very noticeable. I went into the sound settings and started checking those. I found that Dolby Sound was for some reason set as off. I turned that to on and the drop outs ceased so it seems the sound bar wants a dolby signal to be stable. That's my experience.