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It sounds like a capacitor in the set has failed and is shorting out after some time at high voltage. I doubt that there is anything that you can do short of repairing or replacing the board on which is it mounted.
There is no way to change the format once PIP is in use. Try unplugging the receiver for 10 seconds and plugging it back in. I would also recommend making sure your formats on both TV's are set correctly.
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I'm not familiar with this TV, but normally it's either a lose connection (scart), make sure all your connections are pushed in firmly. Or you have the incorrect input selected on the TV. You're looking for a circle or square with an arrow in it on your remote; press it to cycle through your inputs. All this is assuming you have a set top box, sky, cable or pvr etc connected to your TV.
the horizontal stage of your tv has changed the oscillation speed, this can occur due to the following.
i reduction of power
ii capacitors changing values
so take your set for repair before it switches off completely,