Just wondering if anyone else has had a problem with the grates on the top of the stove. We have a 2005 - 3400RL and used it from Feb, 5th to April 4 this year. I know that it was level- but the front burner grate is so slick that I was afraid that the pan would slide off. All I had to so is just bump it and away the pan would go. I got so that all I would use were the 2 back burners.