Hi! I have a Waring Pro Belgian Waffle Maker that is about a year old. Recently, the waffles have been sticking. I oil both sides of the grid well and have make sure it is hot before adding the batter. I usually use the #5 setting for heat. After the machine beeps, I try to open it, but it results in the waffle being split in half and sticking completely. I have tried leaving it a little longer but it still sticks. Any suggestions? Thanks!