[mtgjudge]

In response to the questions thus far:

-the TV is approximately one year old (curiously, the second TV in the bedroom, which was purchased at the same time, is operating fine)
-I do not have a fire stick; my understanding is that the TV has redundant functionality to a fire stick (hence the moniker "Fire TV")
-I do not have cable, therefore there is no Xfinity remote - there is only the app

This "update screen" comes up immediately upon powering on the TV.

I appreciate the responses, and thanks in advance for any help.