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I've had a Roku 4 since late Nov 2015 so I could watch the bowl games on ESPN with SlingTV app. I also bought it to go with my SUHD. But no matter what channel on Sling, every 15-20 minutes, video would degrade, freeze, then get the buffering screen forever. I used the Sling credentials to get WatchESPN so I could watch the bowl games.
Sometime in Jan I contacted tech support through chat & we went through all the steps , uninstalled the Sling app, reboot the Roku 4, reinstall app, etc. Didn't help, so the tech made a tech ticket and sent it in. Alot of people have the same problem.
Well, no one, Sling or Roku has done anything (I've also posted on the Roku forum- they have some engineering guys there) so I emailed Sling tech support with my ticket number etc & got an email to do a list of steps & checks. Well, these are what I have done several times , so I emailed back to inform them that doesn't work (my bandwidth etc is great).
Got an email today from Sling tech support and they hope to have a fix ASAP. I watched the History channel & some live NBA on ESPN & no problems now.
Happy camper now. I never have the lip sync issue some seem to have with the Roku 4 even with UHD stuff on Amazon Prime Video. I think their issues are with their AVR's though.
Now when Netflix gets alot of UHD stuff & HDR gets worked out, I'll upgrade my Netflix account.