I've been doing a lot of printing with my Tech 1, but have given it a break for about 2 weeks. I fired it up last night to print something for my wife and noticed the temperature of my print bed is fluctuating drastically. Both on the printer lcd and in S3D it randomly jumps to different temps. Just when I turned it on, I'm watching it go from 7 to 16, then to 40, back down to 6. All of this in about 20 seconds. Anybody know what would cause this?