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Hello there this sounds like a loose cable connection. If you are using component cables to connect the equipment to your TV, please make sure that all three cables are securely pushed in on the both the equipment feeding the TV and the TV itself.
The three cables will be coloured as Green, blue & red.If this does not fix the problem, does this happen with whatever you view on the TV?What equipment is connected to the TV please & what is the model number?