Just found out I have a defective SR309 based on serial number. I have the static and shutdown problem, but also notice frequent audio dropout using HDMI or optical (but not with analog) from my U-Verse cable box, and delayed audio when switching channels (picture changes instantly; audio follows 2-3 seconds later). Had exact same setup w old Sony receiver but didn't have any of these problems.
I'm hoping everything gets fixed - or maybe they'll just send a new unit. Like with the just-released SR313. Wishful thinking, I'm afraid.