Other users have the same problem, sometimes after booting the box it is not able to tune. Around 08.2014 / 09.2014 the drivers for et4000 have been updated. Could you please rollback?
Upgrading et-dvb-modules-et4x00 from 3.8.7+20130522-r0 to 3.8.7+20130807-r0 on root.