I had a similar system and a similar problem - after a short time of being on the powered woofer shut down with a thud. It was traced to a poor connection in the wired remote volume/balance control. If you have such a thing, give it a jiggle about.
Best Black Friday Deals 2017
How modern book design was influenced by illustrated manuscripts
Best Black Friday Apple Deals 2017
Les meilleurs logiciels de montage vidéo gratuits (en 2017)