this time a Siemans built in combination microwave. rust around the grill support allowes microwaves to leak out into the case and affect the electronics
built 2016 so about 8 years old, for an appliance of this manufacturer its well below expected standards
This is normal at the moment nothing surprises me can’t say any appliance is built any better now than another and they say its because of moisture and people not wiping them out after use