Hi, I’m new to this site and could use some help and guidance on my Cumberland my 3800 pellet stove. I have had this stove for 10 years and have liked it very much. Had to replace the tri x controller once and the convection motor this year. I’m having an issue of my controller changing from a setting of the range 3 and sometime while it is running it will go down to a range 1 and run or just go down. There is no over temp, just goes out with the range change reading down to 1. What would cause this to happen? Is it a malfunctioning tri x controller or something with the snap disc or other? The stove is always cleaned along with the venting. It just leads me to think it is the controller. Where do people get there parts these days as long as this stove is no longer made? Thanks