Hi,

I installed arch today on my desktop since I've been enjoying it for a while on my notebook now. I switched from fedora 18/19 where I had the same issue. My system crashes from time to time and I cannot tell why. The only suspicious thing I can find in the kernel log is this:
....
[ 1851.492415] delay: estimated 353, actual 0
[ 1851.494357] delay: estimated 265, actual 0
[ 1852.653080] delay: estimated 353, actual 0
[ 1852.653097] delay: estimated 353, actual 0
[ 1852.796853] delay: estimated 266, actual 1
[ 1854.658701] delay: estimated 133, actual 1
[ 1869.697322] delay: estimated 178, actual 1
[ 1922.345484] retire_capture_urb: 203 callbacks suppressed
[ 1922.348465] delay: estimated 221, actual 0
[ 1923.132729] delay: estimated 354, actual 1
[ 1923.706902] delay: estimated 221, actual 0
[ 1928.362525] retire_capture_urb: 21 callbacks suppressed
[ 1928.362534] delay: estimated 354, actual 1
[ 1928.365519] delay: estimated 222, actual 1
[ 1930.275305] delay: estimated 310, actual 1
[ 1936.468973] retire_capture_urb: 23 callbacks suppressed
[ 1936.469163] delay: estimated 353, actual 1
[ 1944.932383] delay: estimated 353, actual 0
[ 1988.871489] retire_capture_urb: 9 callbacks suppressed
[ 1988.871592] delay: estimated 310, actual 1
[ 1988.871596] delay: estimated 354, actual 1
[ 2016.687430] delay: estimated 90, actual 1
[ 2052.827674] retire_capture_urb: 8 callbacks suppressed
[ 2052.827683] delay: estimated 353, actual 0
[ 2052.829655] delay: estimated 265, actual 0
[ 2057.651114] delay: estimated 354, actual 1
....

These delays seem to happen when I watch youtube videos. Especially when I change to fullscreen and back a lot or fast forward or select a time in the video that is not preloaded yet. Generally by putting a lot of stress on the flash application. The system doesn't crash right then but it is the only thing I can find in the log that doesn't make sense. If you google the problem there seem to be other people who have the same problem but no fix.

Maybe you have an idea
Regards