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I know this is an old thread, but I don't know if you found a solution to your problem.
It sounds more like overheating to me.
Do you have it in a well ventilated place? This things get extremely hot, and if you don't have enough room to dissipate the heat, it could really damage your unit.
I have an open slot right under it in my rack, and sometimes place a fan under it. There are some cheap multimeters equipped with a thermal probe. Try measuring the temp on the IC's and transistors once it shuts down. That will probably give you an idea on how hot it is getting.
Hope this helps.
DP
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