Same issue here. I'm finding it only on TBS. Have an HDMI connection but other HD channels don't have a problem. Also, the local commercials are synced, not the national commercials or the programming.
Problem is on all tv sets. Both sets are Samsung. I did do the easy stuff, rebooted boxes. The problem is with only one HD station,
WGN. The Cox tech help chat proved uneventful. I am using HDMI from the HD receiver but all other stations, Std and HD, do not have this problem. I am in Baton Rouge, LA. I will look to see if the TV settings has a sync HDMI. I think the problem is originating with the network source and Cox doesn't know how the fix it. I will try a few things to see if this helps, if it does I will report back to the forum.