Whilst I'm here I may as well ask about another strange electrical thing I've had intermittently for a couple of years.
When I switch the garage light off it sometimes disconnects the sky Q box in the living room. Though I was going crazy but it definitely does it.
It doesn't put it into standby, the box still has the green light on but my TV brings up the "no source check connection" screen as though the box had gone into standby. I have to press the power button to actually put it in standby (yellow light) then again to put it back on for it to work again.
This only happens with Sky Q source and only when the garage light is switched off not on, it never happened when I had Sky HD and must happen 20% of the time, it also sometimes nearly does it, ie flickers if that makes sense.
I contacted sky but they're not really interested.
Thanks.
EDIT I've actually had the Q box swapped but no joy