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have WM CGA4 boiler Taco 007 on return heat loss for home under 60,000 btus 3/4 copper fin single loop around 180 liner feet of piping, boiler temperature reaches 180 burners shutdown and in just over two minutes temperature drops to 160 and fires again, no under ground piping, supply copper at boiler can't hold on to, return copper can hold on to for a few seconds, base board with fin 95 feet, talked to customer service for Weil Mclain said every thing is fine, never had boiler drop 20 degrees in two minutes before, first time posting looking for some help.