Solo se me ocurre que le estén llegando menos de 11v y se apaga para ahorrar...
Miré el manual por encima.
Cita:
The equipment is supplied from a separate battery to that used for engine
start. Voltage drops below 10 V, and starter motor transients, can cause the
equipment to reset. This will not damage the equipment, but may cause the
loss of some information and may change the operating mode.
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Cita:
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Input Voltage 12V nominal (10.8 to 15.6)
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