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bad internet connection

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I am starting to teach online but my internet connection (comcast) has been viewed as unstable and upload speeds are way below standards. Why? Is this typical of Comcast internet connections?

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Wifi or Ethernet?

Check to see if Comcast is reporting an outage for your area (see https://www.xfinity.com/support/cable-tv/outages-in-your-area/).

If no outage is reported and you want to troubleshoot this yourself, please see Connection Troubleshooting Tips. If you still need help, please provide Information Requested for Connection-Related Posts.

If you are using Wifi it's best to switch to an Ethernet cable connection if possible while measuring speed and checking the reliability of your connection to Comcast.

If you can't find the problem or you'd rather have Comcast do the troubleshooting, call them at the phone number on your bill or 1-800-Comcast, or chat with them using one of the "Trouble" options at https://www.comcastsupport.com/chatentry/. If they can't fix the problem remotely, insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (https://www.xfinity.com/support/account/service-protection-plan/, about $6/mo). If the trouble is due to a faulty Comcast modem, eMTA, gateway device, or anything outside your home, you shouldn't be charged.