I reheated the two snugglesafes at 7am and now at 9am, they are barely giving off any heat at all. They are warm if I put my hand inside the cover but to touch outside I can barely feel anything - whether it feels different for the piggies? It’s not even particularly cold in the boys shed (14 degrees vs the outside temp of 6) so I am concerned that they aren’t going to keep them warm for the stated 10 hours when it does get colder. Am I doing something wrong or are my expectations of them wrong? They are being heated in the microwave for the stated time.