SepticSceptic: I might be misreading something here - you mentioned that you were running Vail - the next iteration of WHS, (sans Disk Extender tech), you were getting sound and video dropouts from content served from Vail ? Or did you mean WHS v1 ?
This was with the Vail beta which included Drive Extender. Drive Extender won't be included in the RC or final release of Vail though.