I am having auto sync issues with my C61K and Vizio sound bar. This issue is only when audio is set to Dolby or Dolby/Atmos. Regular PCM(?) audio, there is no issues. I have a LG B7 and using optical audio form TV to VIZIO sound bar. I bypassed TV and went straight from C61K to SB and same issues. Any ideas? The LG B7 does have an duo since adjustment, but I can see to get it right.