I bought
commercial refrigeration [ianboer.com.au] - three cameras, I bought four years ago. For all the time, only the thermal relay has flown off, replacement under warranty. To undermine the life of the unit, you need to clean some garbage, I have it at the very bottom of the refrigerator and is clogged with all kinds of filth. Cleaned every six months. Signs that it's time to clean, puddle near the fridge;).