Noisy replacement dvr

I recently traded in my x1 dvr as I was receiving messages that I needed to upgrade to take advantage of new features. I made an appointment at my local xfinity store and swapped out the device. “New” device has a clock and is making loud fan noises all of the time which is disturbing. I would like a more current 4K box to solve the problem. How can I go about doing this. Thanks!