I think that shutdown happens when your wow and hb get out of sync. I've noticed that when I lag while my toon moves and is lagged in that certain spot, it thinks a GM might have moved it using Log Me Out Plugin. This can happen outside of the plugin too, but I'm pretty sure it's a sync issue between the bot and wow when the apps aren't aware of each others locations.
Same error I've been getting, already posted @ bug reports.
On a side note, I have noticed that HB lags my client a lot these days. Some frames take like a second or more to "process", and this is on a pretty decent gaming PC. This often results in the bot thinking it's stuck and jumping.
I run Dungeonbuddy at night to grind random dungeons and in the middle of the night everything is closed, I have to restart everything...
I tried something this morning though, haven't tested yet.. but maybe try disabling your Screensaver // Turn off monitor/sleep after 15 minutes or what so ever... It might do the trick ??