Xfinity streaming not working on one of my fire TV’s but other streaming works fine

All streaming work fone

 Xfinity is stuck in every channel 

sometime a channel works but when I change the channel, it stops again…. Shows the three dots in the middle of the screen like it’s thinking 

I’ve unplugged for 10 seconds, 60 seconds, overnight

I’ve uninstalled the app, erased cache, reset tv to factory settings 

I’ve erased WiFi and reinstalled 

WiFi is fine all over the house , it actually shows strong on this TV

what’s going on!!!!!