Tvheadend

Hi,

I'm running tvheadend on my openmediavault server.
Everything is running fine when I watch livetv with my client.
But when I shutdown my client and tvheadend is grabbing epg data, I will get these errors after a few minutes:

2015-01-23 06:25:20.439 linuxdvb: DRXK DVB-C DVB-T : DVB-C #0 - poll TIMEOUT
2015-01-23 06:25:21.214 linuxdvb: DRXK DVB-C DVB-T : DVB-C #0 - poll TIMEOUT
2015-01-23 06:25:21.988 linuxdvb: DRXK DVB-C DVB-T : DVB-C #0 - poll TIMEOUT
2015-01-23 06:25:22.762 linuxdvb: DRXK DVB-C DVB-T : DVB-C #0 - poll TIMEOUT

I have to reboot my system to get it running again.

Can anyone help me?