Had similar problems as reported on this thread -- radio working but intermittent sound. Tip: if you are searching ebay for a replacement amp search for a Jeep Infinity Amp as they used the same amp as the Crossfire in older Jeep models. Only difference are the mounting brackets which can be changed easily. Crossfire Infinity Amps on ebay run $300 and I picked up a Jeep Infinity Amp for $65.