I appear to get an intermittent loss of signal just recently whilst watching programs and my v6 box goes into an automatic reboot. Which is slightly annoying when watching a program which also interrupts any recording that are in progress. When performing the signal checker it reports no problems in my area. This is also coupled at times, when the v6 box does not switch into standby mode (i.e. overnight) as when switching on the TV in the morning only the last channel you were on is available and none of the TV remote buttons work (i.e. TV guide / My shows / up down channel or specific number selection). The only way to restore is to switch the box off and on again.
There are no error codes. Examples are last night at 19:16 whilst watching a recording the picture froze and then the box rebooted itself, and this morning at 11:10 on a TV channel 5 the picture froze again but was stuck for 5mins so had to do a manual reboot.