CDX-M30 losing power

I have a marine CDX-M30 marine stereo in my boat. If the stereo is not turned on for a month or so, it looses all the stations/time (as if it lost ground and/or power). This occurs on its own, IE I am NOT cranking the engine, lowering the voltage below 12 volts. As long as I turn on the radio at least once a month, even for a moment, there's no problem. I checked for any updates for the unit, there are none. This is the second unit, (the first one, same model) did it more often. West Marine replaced the unit with this one, it has only happened once since (I turn the radio on weekly).
The battery is a class 27 and is always on a charger. I have replaced the main line, also replaced with new connectors from the battery to the main console. The stereo two hot lines and ground are wired direct to a SS power distribution block under the console. All connections are spotless. There are no fuses inbetween the battery and the power distribution block. All accessories are fused after the block. Note: the time clock on the Yamaha gauge does NOT loose time.
I was told by Sony the memory is stored in the main head, not the removeable face plate.
Any idea's???????

I suggest you contact our Technical Support team for further assistance: http://esupport.sony.com/US/perl/contac ... mdl=CDXM30

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