I lost my hive last year going into the end of fall an from the looks of it was CCD only about a hundred bees were in the hive dead an none laying around no sign of any diseases, honey wasn't even touched. So they never had a chance to winter. Now after reading so of these post on here it sounds like some keepers lose there hives over winter and are blaming the screened bottom I guess allowing to much cold air into the hive. Does anyone have any input on the subject I live in PA an some times have harsh or mild winters. If this is something I should be concerned about what are my options making a completely solid bottom board to replace the screened one with?