Xi6 box question/issue (DVR related)

I recently bought a new 4k TV (LG G4 77") and with it , I obtained a 4k box from Xfinity.

As this TV supports Dolby Vision and the Xi6 box is the only one in Xfinity's lineup that supports it, I have a Xi6 box connected to it - directly to it, no receiver or anything in between, and using the highest grade certifies HDMI cable out there. (eliminating THAT as any source of my issue)

I have a wired 4k /DVR box connected to another TV in the house.

A couple of weeks ago, XfinityFrank provided concise answers I had regarding this Xi6 box, one of which was that ALL recordings played on this box are from the cloud (as opposed to off the recording on the in-home DVR) - the could of HD boxed I have in my place generally access the recording from the DVR.

Mr. XfinityFrank assured me that this was as intended, perfectly normal, and not to worry.

What I have come to notice is that upon playing back recordings via "the cloud" whenever there is any type of moderate top fast motion, I see a "rainbow halo effect" as if there is lag and any sharp image becomes a blur of color on its edges.

To be clear, this NEVER happens with live TV on the Xi6 box., this NEVER happens when I am playing a UHD or Blu-ray disc, it does not happen when i am utilizing the apps within the Xi6 box. It does NOT happen when I hooked up an antenna and was watching over the air content.

The ONLY time I see this (and it's quite noticeable) is when accessing these DVR recording (that "as intended") - are from the cloud.

I did find one was to mitigate (but not totally eliminate) this, and what was to change the resolution output from 4k60, down to 4k30 -maybe the cloud recordings don't like being upscaled and played back at 4K60

Less frames per second = less rainbow schmear perhaps?

I am hoping to hear from others that may notice this phenomenon, in their sets, or perhaps an Xfinity expert can chime in and explain what's going on there. Maybe there is a solution, or perhaps something to pass along to the tech people.

Any and all assistance is appreciated. Thank you for your time and consideration.