Thank you so much for your reply. Your feedback helped me better understand the two graphs. Now I know to pay attention to the speed of the top graph. I don't recall seeing that big drop in speed in most of my results but I will pay attention to it for a while. I had Comcast come out on Tuesday (today is Friday) and they made some tweaks on my connections and he told me there was also a problem reported at another house in my neighborhood. So hopefully the graph above become more consistent. If it continues to act sporadic I will reach out to you and send the information (modem, router, computer, subscription, browser and another computer) you suggested.
Thank you again for your help. I appreciate you taking time to reply.