I need some help figuring out what's happening with my keezer. A couple of months ago I noticed that I couldn't get beer to flow and discovered that keezer got too cold. Beer was frozen to a slush. I caught in time to save beer. I swapped temp controllers and that seemed to fix the problem. Wrong, it happened again a couple of weeks later. I swapped cords and outlets and it appeared to be working fine, but it happened again. I'm out of ideas. Any help would be greatly appreciated!