My TV linked to my V+ box goes blank about every 20-30 minutes, usually for between 3 and 8 minutes at a time.
Sometimes switching the TV on and off again sorts it out, but other times nothing works - we just have to wait until it comes back on again. It's very disruptive and makes it impossible to watch any programmes at all. What I've missed when the screen goes blank can't even be retrieved by pressing the backwards button to access delay TV.
This has been happening for months, and it's got to the point where we can't really watch the TV in conjunction with the V+ box.