So I'm still having the same problem with the source going quiet on a at least a couple of my streams daily.
For the record I'm using CentovaCast 3.1.1 and Liquidsoap 1.1.1 of course on Debian Wheezy 64bit.
So stopping and restarting the autodj only appears to fix the problem but log writing appears to go screwy unless you restart the stream too.