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Could be a problem with the thermopile (the flame sensor in the pilot flame) or possibly a venting issue. First check the vent for obstructions. One of the possible problems with the thermopile is that a stray flame (not the pilot) is getting too close and overheating the bottom of the sensor. Since this device generates all the power to operate the gas valve (< 1 volt) if it over heats it will kill the power. If the vent looks good do you have a digital multi-meter that can read mili volts.
It's a thermopile. A thermocouple is used on a 24 volt system. This is a millivolt system with all the power generated by the thermopile. Since the voltage is so low (< 1 volt) any iffy connects will be very problematic. If you continue to have problems with it shutting down for no reason then you need to check the voltage output from the thermopile or see if any stray flames from the main burner are impinging on the thermopile.
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