Screen goes black with progress circle every 5 minutes or so.

https://forums.directv.com/conversations/watching-directv-stream/samsung-tv-directv-stream-issues/619a754b4d566d44a52753f0?page=1

Samsung specific but the symptoms will look familiar. You might try buying a Roku or Firestick and using it over your internet connection instead of going directly through Frontier's service. Buy from Costco or Amazon or somewhere else with a (Edited per community guidelines) return policy. This is just for diagnostic purposes, as those devices are suggested almost universally to address this problem on other platforms. Frontier is regional and its unique access process may limit the variety of answers that you will find useful. Testing with a more universal device eliminates that variable. 

I am experiencing the same issues with my 2 samsung tv's.

This all started "after" the AT&T u-verse application on both tv's were automatically upgraded to the Direct TV streaming app which was about 2 months after i moved in and had AT&T fiber installed.

Note: the buffering, spinning issue only happens when using Direct TV app.

There are no issues with any of the other streaming apps on the tv'.

Yes i am running wifi, and there are no filters or configuration settings to cause interferance.

Both tv's are within 20 feet of the router.

Even tried hard wire from the AT&T router to the tv.

Still the same issue.

Third tv doesn't have wifi, so we have the at&t box which is wifi capable.  No issues there.

Called Samsung about issue. They said to call AT&T support.

Called AT&T support tried some things and when they couldn't help, they said to call samsung support.

All troubleshooting done definately points to the direct tv streaming app on samsung.

Maybe AT&T should bring back their U-verse app for a bit.

Maybe you should get an external device and start enjoying the service. Nothing wil change and there are no fixes. The app has always been inferior and has nothing to do with the last transfer of ownership. Been unacceptable for years since its conception. 

The issue is definitely with the Direct tv app. I have 2 Samsung TV's with the issue.

When i first moved into the residence and AT&T fiber was installed,  i had the AT&T U-Verse application on both tv's thru my wifi.  Had no issues for a few months.

The buffering/spinning issue all started not to long after the U-verse application automatically upgraded to Direct TV streaming app.

Both tv's are within 20 feet of the wifi router, so there is no interference issues.

Even bypassed the wifi and hard wired directly to a tv.

Still the same issues.

Have a 3rd tv that is not wifi capable that  has the AT&T box (wifi enabled). No issues.

Called AT&T support and ran thru a bunch of troubleshooting tasks.

Unplugged tv for 5 minutes.

Unplugged wifi for a few minutes 

Unplugged AT&T main router.

Uninstalled and reinstalled Direct tv app.

Nothing worked.

AT&T tech said to call Samsung support.

Called Samsung support and they dont support any of the third-party apps and said to call AT&T. 

All issues and troubleshooting performed points to the Direct tv streaming app.

All other streaming applications work fine.

HBO max, netflix, disney+, Vudu, youtube.

Maybe AT&T should bring back the U-Verse application which worked fine before.

@Bubba1193 ,

Yup, the Samsung App is junk. Who knows if it will ever be fixed. You'll have much better experience with a DirecTV Stream box, Roku, Fire, etc.

U-verse has nothing to do with the DirecTV Stream app. Mute option for DirecTV Stream subscribers with DirecTV Stream. There are easy options with true streaming devices and seek another service.