Television/Light switch issue

product-of

Standard Member
This is a little bizarre but when my tv is on (a LG M228W) and a light is turned on or off anywhere in the flat the screen goes blank for a couple of seconds.

The sound stays on and the on/off light still says on but the screen seems to turn itself completely off.

I was wondering if anyone has any idea why this might happen and what can be done.

The TV is plugged in along with 2 games consoles to a surge protected 4 way gang extension lead.
 

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