I had reservations about purchasing a built in drawer microwave;  however we've had a GE cafe over the range microwave in the past with no issues.  We purchased the microwave and had it installed in March 2023 and unfortunately today (9/7/2024) it started to spark in the interior right back corner.  The unit was not improperly used, ie. only used microwave safe dishes and unit was kept clean.  Totally disgusted as this was a custom fit and now the product is sparking at 18 months old.  We have an appointment with GE service tech and understand we are out of warranty coverage (warranty only for 12 months).  Hopefully it is only a minor issue and can be repaired.