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Studiomaster Powerpack 200: sound stops after few minutes of play

My studiomaster paowerpack 200 mixer stops producing sound after few minutes. When  i press the button obove the "Thermal" . Then it starts again but only for 15 - 20 minutes and again stops. I changed its fan, assuming it is heating issue but it did not fix the problem.
Please guide, what is this problem and how to resolve it.

thanks.