I ahd this exact same thing happen on my K2500XS. I brought it to the local authorized Kurz service center, and $450 and several transistor replacements later it still did the same thing. I sent it to Sweetwater, and a couple days later was told the KDFX unit was bad. It was still under warantee, so I now have a fully function system. I've left it on for over 4 days in a row - no problemo!(posted 8245 days ago)