I thought I'd batch all the answers together.
Andy suggested something about transfer buffers being dropped out of
rotation. I'm not sure exactly what this is but if it's anything like
ethernet buffering it would explain it. It would also explain why it
lasts longer on the lower bit rate standard definition TV rather than HDTV.
In response to Antti's question, I have indeed tested kernel 3.1.6. This
was where I originally noticed the problem. I upgraded to 3.2.0 to see
if had been fixed and when I found that it hadn't posted here.
I pulled the LinuxTV.org v4l-dvb from mercurial but it looks more like a
patch than a full kernel (the previous one I pulled seven months ago was
a complete kernel). For reference the 3.0.0+ kernel that came from
LinuxTV.org v4l-dvb seven months ago has functioned flawlessly ever since.
I've just downloaded the media_build.git stuff, installed the extra
packages it needed and it's be building now.
The other card in the system is a very old Nova-T. It's got a LSI L64781
frontend on it.
Finally Steven said that it might be signal, hardware or heat related.
I'm unsure of this because if I boot the machine with the 3.0.0+ kernel
with exactly the same user-land everything it functions perfectly and
has done for months.
I'll report back on my adventures with the media_build changes to the
3.2 kernel.
Best regards,
Jim.
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