For the past 6 months, within a few minutes of cycle start, front door pops open spontaneously. After closing door, it will pop open shortly thereafter. Current remedy is to wedge a door jam between countertop and top of dishwasher door. I hear a popping sound, but door is wedged shut so cycle continues.Issue occurs on all cycles. Door seals look good. Dishwasher is level. Racks fit in properly. Door tension seems a little light (door opens with little force), but is unchanged from initial installation 3-4 yrs ago. Any help is greatly appreciated!