POLK DSB1 SOUNDBAR AUTO TURNING OFF

I have had my polk DSB1 soundbar for a couple of years and for about 1.5 years it auto shuts off after about 15 minutes of use. I only shuts off using Digital Optical cable but it also has problems with freezing when switching modes. I would really appreciate some help with stopping it from auto shutting off as I have called Polk and they did not help me

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