A few weeeks ago for my birthday my large egg received a new winter coat. My old cover had worn through at the top. I put on the new cover. It is longer than the old one, and it is vented. I am haveing a big problem with moisture. When I uncover it there is moisture on the dome on the outside and when I opened it there was drops of water on the cast iron grate. I have it covered when not in use, but it seems like it would be better left uncovered if I am getting this much moisture on and in it. Any thoughts and/or suggestions concerning this problem? Thanks.