There is a recall from Jayco. This info is from the Good Sam Club Sam Alert info.
Jayco, Inc. (Jayco) is recalling certain model year 2013-2014 Seneca, Pinnacle, and Eagle Premier, and 2014 Precept motorhomes and fifth wheels manufactured January 14, 2013, through August 26, 2013, and equipped with Electrolux/Frigidaire KG series microwaves, models CFMV152CLB and CFMV154CLS, manufactured January 27, 2013, through April 10, 2013, in the serial number range KG30607951 through KG31600670. In the affected vehicles, the microwave may start on its own and begin heating when unattended.
Not sure if you are having the problem described but the model number matches yours. Hope you are able to get it fixed or replaced.
Craig & Terry in Tennessee
2013 Pinnacle 36 KPTS, Voyager Rear View Camera
2012 F350 CC LB King Ranch, 6.7L TD, Ford 25K hitch, TM TPMS, Diesel Site Coolant Filtration System