I have had stove for 5 years, this is first year I have had trouble. The stove starts up fine everything in working order. The convection blower comes on fine, but after 10-15 mins. The convection blower starts to turn more slowly. If I try to lower fan speed the fan will basically stop moving, but is trying to spin. Turning it to a higher setting doesn't do anything. I have replaced convection blower, control panel, and system snap disc. Still having same problem. Any help would be appreciated.