I have an ASUS M3A78 Pro with on-board audio w/ SPDIF output. When connected up to a Denon receiver (via digital coax), the signal will intermittently drop out. I've tried rolling back the driver and get same issue. Output works fine when using the analog outputs to the receiver. I've also verified that it is an output issue by hooking a DVD player to the receiver and get no dropouts. Any ideas?