Sony Trinitron A68JMT50SX from 1989.

I have a problem with this TV. Despite it's age, it is really good. Anyways, The problem that I have is that it works fine for a couple of minutes, however then it starts to flicker and the screen gets fuzzy as if there happen to be interference and it also cuts out the sound too. Any ideas as to what it can be? Thanks for your help.

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