I have been using Comcast for years, with THEIR equipment. The last time I had problems, it turns out the cable drop from the outside box (back yard) to the box in the garage went bad. They had to install a new cable drop. The computers show 35 meg download and 20 meg upload (these are older computers), the phone shows over 300 meg download on wifi.
IMHO, if you are using Comcast equipment, request to have a technician come to your house and take actual signal level measurements, this is how they found the problem at our house, we went through all of the resets and modem reports before I had the tech come out. The problem was actually big enough, they had to get a second tech out.
As for signal strength, their newest modems are not a good as the older modem, so I am in the process of moving the modem, just finished relocating some of the cable connections will move the modem in the next day or so.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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