Your CO/LP alarm runs off 12V DC. I am assuming the surge protector is in the 120V AC feed from shore power. The only possible connection is that the surge protector shut down the AC, including the converter, and you were running off battery.
If the AC was shut down, even momentarily, and your battery is weak or mostly discharged, that could trigger the low voltage alarm in the CO/LP alarm.
Without knowing more details, that's the best I can do.
Fred W
2014 Rockwood A122 A-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time
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