Hello, my father gave me his Pioneer sx680, the amplified has the following fails: with any input, radio, auxiliary, phone, Tape 1 or 2, with the headphone outputs or speakers. At 20 or 25 minutes of running the sound starts to drop, distorts a little, portrays one up and it becomes clear. If I turn off and turn on the aplificador the fault disappears and the error to occur approximately 20 minutes. On the other hand I have felt the components and do not find any hot. any ideas? Thank you.