Last year convection blower/room blower on my mount Vernon 4 speed started squeaking. Put some grease on it and it’s been fine and still is as far as noise but now I have another issue. Recently the convection blower will turn on and off multiple times on startup and sometimes it will just turn slowly and do this for a while before actually turning on and functioning the way it should. This is part number 7000-108. Does anyone know if this is a fan motor going out or is it linked to the control box and maybe something wrong with the control box?