Great to hear you can deliver your canvases on time as promised!
The cold definitely affects your coating and corner cracking problem. I'm in Canada and all winter long I have that problem with the cold unless I use Epson Exhibition Gloss canvas, which folds and stretches like a dream but costs quite a bit here ($159 + 13% tax for a small 24" roll). Right now where I am it's -15C or about 5F for you and it's not even really cold here yet, so you can imagine the problems here in Canada when it's cold LOL.
I've also found the adhesive inkjet receptive coating on canvas can vary from batch-to-batch with the same manufacturer. I've used canvas that stretched and folded beautifully. Ran out of canvas so switched rolls with one already here from the same manufacturer, although a different batch number, and it was horrid. Very stiff and it was like folding cement. Of course it cracked like crazy, the stiff batch that is. I've suffered that from a couple of different manufacturers and the only element that changed was the batch number off the canvas. Some of these guys have to get it together and start producing the receptive coating in a more controlled manner. Had the same problem with rubber when I molded it many years ago. The supplier would change the formula ever so slightly and we would produce nothing but scrap because the rubber was so dry. But definitely the cold temperatures will affect your canvas. I can give you a list of canvases that are more pliable and softer to work with if you'd like, but some of them cost more than the Lyve you were using, at least here in Canada it does.
Anyway, so glad to hear the water and hair dryer trick worked for you!