I've made many cakes using all different brands of fondant and I have never had a problem with the fondant tearing while I'm covering a cake but this last week it kept tearing and I kept on redoing it. I even switched brands to see if that would make a difference. Nothing worked. Could it possibly have something to do with the weather? I have made most of my cakes over the winter months and now it is warming up and I was running my cooler when I was working on this cake but I did turn it off to see if that would help and it didn't seem to. Please help me if you can. Thank you.

Have you tired adding more glycerine?  

No but I will try that, thank you.