New Gemini Air device

I am a new customer of Directv Stream and received my Gemini Air equipment this week. 

I hooked it up this morning and it seemed to work fine. But now when I turn it on, I only see a big purple box on the screen. 

I've turned the tv off and turned it back on, but same result. 

If I switch the input and use the Directv Stream app on the firestick, it works fine. 

Is there anything I can do to fix this?

Thanks.