Hello, Really enjoying my U1. Audio passthrough for 7.1 worked great until I just updated to U1 MY47V.20170227. All stereo videos play well in XBMC 16.3 with good sound. 5.1 and 7.1 video plays well in XBMC 16.3 except sometimes sound is muted. It appears to happen always with .mkv files but some MP3 files will work intermittently. At times the MP3 files will play then make an awful screeching sound. Anyone have the same experience? Anyone have any advice?