Before buying an amp make sure that your battery cables are tight. The stereo is the first to cut out with a bad connection and can do so without the clock being reset. My negative cable was cracked in two and caused my battery to go bad. Huge overvoltage situation, I was up to 18V at the cigarette lighter.
If that isn't your problem try messaging Oazix. He might still have a hifi head unit for sale. Nice guy, got some speakers from him, real great packaging.
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