Cox Mini Box Cisco DTA250 pixelation and tiling and running hot Cox send out refurbs that don't work

Have had our Cisco mini box replaced a few times but Cox keeps sending out refurbs that don't work. The most recent one is a DTA250-COX-K9 from 2016. We get pixelation and tiling and it runs hot. The AC adapter/ power cord runs 88-90 degrees when idle and the mini box runs 90-92 degrees when idle. When running the adapter/ power cord is 92 or so degrees and the box runs 98-100 degrees or more.

All other AC adapters/ power cords run at 78-80 degrees at idle and while running. Other devices run about 68-70 degrees around the ambient temperature when idle and around 75-85 degrees when running. No other devices runs as hot as the Cox mini box. The other deices area a Roku Ultra, Nvidia Shield Pro, and audio receiver. Cox mini box has plenty of room to breathe and is on an elevated and vented metal platform. Measured using a Fluke 62 Max + a very accurate IR temp gun.