ATSC Tuning loses audio after a time

[Commodore 64]

Windows Version: XP sp2
CPU Type: p4 3.0e
Memory: 1GB pc3200
Motherboard: Asus p4pe
Motherboard Chipset: i865pe
Motherboard Bios:
Video Card: Gigabyte 6600gt
Video Card Driver:
Sound Card: onboard
Sound Card AC3: onboard S/PDIF
Sound Card Driver:
1. TV Card: Vbox DTA 150
1. TV Card Type: ATSC
1. TV Card Driver: BDA
2. TV Card: Fusion 5 Lite
2. TV Card Type: ATSC
2. TV Card Driver: BDA
Video Codec: nVidia Pure Video
Audio Codec: Mpeg/AC3/...
Satelite/CableTV Provider: OTA
HTPC Case: Silverstone LC03
Power Supply: Silverstone Strider 400w
Remote: MCE USA
TV: Philips 30PW8520
TV - HTPC Connection: Component

CVS: mediaportal-cvs-03-08-2006--01-02

With latest CVS, ATSC tuning works with timeshifting off. After10-15 minutes though, the audio stream seems to have issues. I ouput directly to S/PDIF and the signal will start bouncing in and out (receiver will alternately drop signal and get signal)--it vacillates so frequently that no sound is outputted, but I can see the receiver bouncing from PCM to AC3 constantly.

Also MyTV tuning doesn't work with timeshifting enabled.

http://mpteam.pastebin.com/590671