I’ve been getting this for a few months when watching Netflix on the TiVo in what I imagine are peak periods. It doesn’t happen in the day time, just in the evenings and never happens on my IPad. It’s totally random and Some evenings are trouble free. I see the spinning disk showing buffering and it stops at 25 %, pauses for a bit and then says “Your device may not be connected to the internet. Please make sure your connection is working and try again. “
Usually,if I back out and select 204 again, press the red button, etc. it works for a while more and then the same thing happens again. It might work for 10 minutes and it might work for an hour. It’s very frustrating.