I can't diagnose issues remotely. If Comcast can't help you, I would drop them like third period French ( assuming you live in a part of The Villages where you have a choice of ISPs )

streaming tv
 

Can anyone tell me if you need to have roku or anyone of those other boxes to do streaming. I have a smart tv and amazon prime. I can watch it on my smart tv but not for long until it says I have low bandwith. I am going to move the modem next to tv. I have comcast internet blast. Also nexflix and hulu can also be watched. So why would I need to purchase roku etc. I am at a lost. Only thing I know is Comcast cable has go to go. As I know nothing about this technical issues any of your help would be greatly appreciated. Please feel free to email back so I will be sure to get the info. Thank you all.

If you have a smart TV you don't need another box for streaming. While a Roku box will probably give you access to more material than your smart TV can, the lion's share of what you are likely to stream is available through your TV.

The bandwidth issues can be caused by poor WiFi performance. There are a few things you can try such as moving the Comcast box closer to your TV, changing the WiFi channel on your Comcast box (there are typically several WiFi channels available and the default may not be the best), and, lastly, using cat5 cable instead of WiFi (you need the Comcast box close to the TV and your TV must accept a cat5 cable). I am assuming you don't have any issues with what Comcast is delivering to your Comcast box - you mentioned "Blast", I believe that is a reasonably high bandwidth offering.