Pro 6-Inch Hot Knife - #035P6 (Needs Pro Power)

I purchased a kit for a set build of a high school production. I ordered the 3" hot knife as part of our kit and quickly realized that I needed to add the 6". In the course of one weekend, the 3 inch and 6 inch both stopped working, and our Freehand Router kept losing heat as well. The hot knives stopped working entirely, but the router would start working again if you turned it off for a while and restarted it. I've sent an email but have not heard back yet. I LOVED the tools up until the point they stopped working, though. My hope is to hear something back from customer service regarding possible solutions.