I am sorry to hear that you are having speed issues with your interent service. Are you using wifi or are you hardwired into the modem with an Ethernet cord? We find with all the traffic on the interent right now the most stable solution seems to be the hardwire option. Please let us know if you have any other questions we may address. Have an enjoyable weekend ahead- Stay Well!
I am sorry to hear that you are experiencing issues with your download speeds. At this present time, COVID-19 has impacted a lot of internet speeds around the country, due to a term called Node Capacity.
If you call 1-800-COMCAST, and speak with a rep in technical support, they can see if your signal levels are adequate. If the signal levels are good, then you could be experiencing Node Capacity, as the bandwidth is being stretched due to abnormal traffic via COVID-19 Work From Home situations.
If the signal levels are not good, then you can improve this without a technician by unplugging the coax cable from the wall plate for a few seconds to refresh the signal. In addition, a Comcast technical representative can provision your modem, and you can do a pin hole reset on the back of the modem. Be sure that you only engage the reset button for 1 second or less, as you do not want to factory reset the modem.
Having a device connect hard wired via a Cat5e or Cat6 ethernet cable certainly can help as well, as I have experienced better working conditions with this set up.
Outside of these steps, you may need a technician to come out to the home, if the signal levels are bad enough, in order to check the line outside running from the tap. I hope this information is helpful. If you have any further questions, please let us know.