I have had my DST-3000 for several weeks. Over the weekend, I moved it from the top of my rack to a position between shelves. The unit would not stay on and kept powering down. I placed my hand on the top of the unit and it was very warm. It had been turned off all weekend. Has anyone experienced a similar problem? I moved it back to the top of the rack where it gets plenty of circulation and the problem has gone away.