I picked up a used vision cage from the local reptile expo and I'm having an issue. I put a UTH on it and that was fine for a few weeks then all of a sudden it shorted out and the sticky came off and it also seemed like it had burnt the bottom of the tank. I am using a thermostat on it so I don't understand what the issue was. I've never used flexwatt and was looking into that. Any suggestions on what to do? I've heard of putting the uth on a piece of glass and putting the cage on that. Does that really work?

Thank you