Polk magnifi max AX SR

I have using this system around 1.5 years... The sound quality and bass is very good I liked this system very much... But suddenly the subwoofer is not working and speakers clarity also decreased.. sometimes back speakers and bar stops working... I have rebooted the system.. I have changed the connector or cord.. unplugged the system for two days to get rebooted, but the problem didn't solve.. and I found the kim gmail here..I have tried to spoke with him but unfortunately he is not replying to mail I'm trying past two days... Can someone give me a solution.... Thank you in advance!!

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