Thanks for the reply. New cable and tried different hdmi ports.. Just remembered, the android is plugged directly into receiver. Guess we need to take that out of the equation. The reason I'm using optical is I have an older spec receiver. No sound sync option that I can find on the cable box, but even if there were, what would account for it being in sync at start-up? When I get home I will try one the onboard apps and see what happens. I didn't think of that. Will let you know, thanksI think if the sync issue goes away using an android box or something like a CC or Shield TV or an app like youtube TV or Netflix, it is clearly an issue with the cable box. I'd try a different HDMI (you've probably tried that) or something as mundane as trying a higher spec HDMI cable (you don't need to spend a lot.)
Does the cable box have a sound sync option? Are you HDMI inputs set to "Enhanced?"