Tvheadend

Hi all, first post, hoping someone can offer some answers to my problem. I have the latest OpenELEC 3.0 (RC 1) - 2.99.1 Fusion x86_64, installed on a Zotac ZBOX nano AD12 with 4GB ram (1GB to UMA) and 128GB SSD. I also have a external 1TB HD attached via eSATA (an ex Tivo external HD) with two partitions for windows & linux use (both called LiveTV). I'm using a HDHomerun dual tuner on my network. If it helps any, info on XBMC: Settings > System info > PVR service: HTS Tvheadend v. 3.3.328~g60371b0(Protocol: 8). Video & audio output to Sony 40" LCD tv (KDL-40W4000) via HDMI.

Installation of TVHeadend was a breeze compared to weeks of frustration trying to install MythTV. The web UI setup worked straight-off the bat, found my tv adapter and scanned all available channels. As an aside, I ran the HDHomerun gui testing & watching all channels (via VLC), before launching the browser to TVHeadend. The only thing I need to sort is my local epg (Auckland (Waiatarua), New Zealand) setup with some user scripts I've seen on these forums.

Now to the issue at hand. Tvheadend constantly freezes/crashes when I switch to certain channels, with the on-screen message: Tvheadend HTSP Client - Disconnected from 'HTS Tvheadend'. I then have to reboot or disable the add-ons and LiveTV to stop this message.

I've noted that it happens only to those channels belonging to a certain provider (Mediaworks: TV3; FOUR; C4; TV3PLUS1; The Shopping Channel). So either they transmit their channels differently that maybe my hardware doesn't understand, or I've done someting wrong somehere.

My xbmc.log is here:
http://pastebin.com/eLyCLWb2

Thanks in advance,
George

Edit: shifted post to correct forum