If you are a Comcast customer you should go to Xfinity.com and test your wifi signal with their speed test app. Do you know what wifi speed you are paying for? If you are only getting speeds in the 20s then I would let Comcast know and they will fix it. I had a similar problem and they checked it out and ended up giving me a new router that is capable of 400mps. That definitely solved the problem. I pay a little more but definitely worth it. I like you also only stream TV with Roku and Hulu and the faster the speed the better ie no buffering.
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