I have Model# LM2100 Serial #NLM03160205524 Feb. 2016. I recently replaced my blade and ordered from you. The old blade was #CH3705938001, new blade is #CH3706059001. The problem I am having orange light is blinking and mower is not starting, sometime. There is no pattern. It may start ten times in succession then not start 3 times or more. I purchased a second mower, 9/9/2018, Model#LM2100SP, Serial#NLM04171105492X Nov. 2017. It has CH3705938001. I have switched batteries from mower to mower and have no problem with the new mower and same problem with the old mower. I am a TOOL Tech. with Home Depot and have been for the past 5 years. I push your product heavily but am a lost on this problem.