I've learned that if the router or modem lasts more than 3 years, the cost of the fans is worth it. I ALWAYS buy my telecom equipment, not rent it. I've invested in a good Asus AC88U router so I wanted it to stay cool so it wouldn't freeze. I haven't done this before and my router usually fails after 2-4 years. Talking about crashes, they don't die, they just start doing weird things, then I reset and flash, and after a short while the device starts behaving strangely, freezes, stops…