4 k box problems

I upgraded to a 4k box during the Olympics.  Programs and recordings started skipping. pausing and pixelating.  Live audio had constant pauses. (the main box and the remotes).  The apps (Netflix) and On Demand worked perfectly.  I've reset a dozen times, checked connections.  reset again.  I can't get though to tech support with out a refresh.  No changes.  I finally got through to tech support.  They wanted to start with the check list. I told them I have done the check list a dozen times.  Finally in the middle of the check list the technician decided I was right.  I stated I wanted a regular box because the 4K box has constant issues.  On April 19, 2021 the technician agreed to send me a regular box and I could mail the 4 k box back.  On April 29, the box hasn't arrived. I called tech support, and low and behold the box had not been shipped.  This tech apologized and said he would ship another box. I asked if I could go to the local store and pick up a box.  He said I did.  I went to the Kingfisher Drive store, turned in the 4K box and picked up a reconditioned regular box.  Came home installed the box, and low and behold, all the issues are fixed.  No skipping. pausing and pixelating.  No more audio skips.  Recordings are perfect (Even the ones recorded with on the the 4K box).  Problem solved. 

Comcast. listen to your customers.  There is an issue with the 4K box.  Please fix it.