So my machine had a full hard drive which was causing errors which I figured out by using this thread: http://knoppmyth.net/phpBB2/viewtopic.php?t=17439
I cleared the offending file but would now like to figure out the cause so I can avoid it happening again.

The offending file was /var/log/mythtv/mythfrontend.log which was filled with "LiveTV forcing JumpTo 1"

I search the forums and google but couldn't find anything useful. In case it makes a difference, the machine is set up as a slave-backend, is using R5F27, and has two PVR-150s. Any ideas what causes this error so much and/or how to prevent it in the future? Thanks in advance.