I bought this last year at Christmas and it was great. I used it at least 3 times a week. It cooked fast and evenly and was a breeze to clean up. Now everything sticks and it takes as long to clean up as my old George Foreman grill. I have another set of ceramic pans that recommends seasoning them once or twice a year to keep them non stick.  Should I do this with these removable plates or do I have to replace them?  I have recommended this to several friends and relatives But now I'm wondering if I did the the right thing.