Hi Jon,

I know how frustrating this is as it happened on our 6-22 but only on BBC and it must have been out of syn by between half and a second.  It takes away all viewing pleasure and is really distracting.  We live in France and only have a simple digital receiver box but I found that the problem had nothing to do with the TV as such. 

I entered one of the satellite box menus and checked some of the parameters shown for the BBC channel (it was a while ago so I can't remember which settings), after playng around with them and comparing the figures to good channels, all of a sudden, when I exited the menu the TV was working 100%.  It was as if the channel information was re-booted or refreshed.

Probably not much help for you but it can be fixed.  Sorry I can't be more helpful than that.  Good luck in getting it back to normal

Dave.

Using external Sky and Freeview boxes at various times on Avant BC1 and BV5, this has been a frequent problem, but always instantly correctable by changing to an adjoining channel, viewing it for a second, then changing back to what you were watching.

The out of synch problem then doesn't return for varying periods - sometimes 10 minutes, sometimes weeks! (I am using quite old Pace and Panasonic boxes.)

Graham