Have only had the microwave in use less than a year and the bottom 3 buttons have ceased to work: Reset filter, Vent fan, and surface light all have zero response. Fan will turn on with sync to the oven as will the light. However,  cannot turn on the fan or the light with a button, only works turning on a heating element. Worked correctly for a while, then did the unplug/plug back in "fix" and now that process no longer helps. Spent lots of money on the microwave and the black stainless handles. Had no idea how poorly the keyboard was designed. Other reviews are stating same problem. Regret purchase.