I suspect the straps because I used to work in a shipping warehouse and the sound, and loudness of the "pop" of this one-time (so far) event closely resembled the sound of a metal strap snapping while tightening it to secure it to a pallet. I'm really hoping the strap is not the issue and I'm starting to doubt my suspicions based on the feedback I'm getting on this thread. Thanks for the feedback on how to drop / reinstall the coroplast. Don't think I will attempt it by myself, but good to know should it become a necessity in the future.