I've only had the Mini for a couple of days and it downloaded an update last night so I've been waiting to see if the problems persisted post update.
But my Mini seems to have a small lipsync issue with Live TV on some but not all stations. My Comcast DVR is not having a problem with the same stations. Also I've noticed that when selecting a channel from the guide that maybe 5% of the time it fails to change channels, but just returns me to a frozen screen from the last channel selected. Bringing up the guide again and reselecting the new channel seems to work.
Anybody else seeing this?