Hi, I need to see if anyone can help me get my stove back working right. After I start it up, it'll run for a bit and then shut itself down. It's been doing it for the last couple weeks. It could shut down after 5 mins or a few hours. I've cleaned the whole inside of the stove, the baffles, and even found a vent behind the right side of stove that I had to unscrew 4 screws to get to which was loaded full of ash that I cleaned completely out. The fans don't seem clogged from what I could see. I haven't cleaned the outside pipe vents though. Does anyone know what I can check or do to fix the stove from shutting itself down? Or what causes this? Thanks for anyone's help in advance.