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Internet slows down at random times for no reason?

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I have been experiencing slow speeds seemingly randomly, and everything I've done hasn't worked.

I have tried restarting the modem, using WiFi, using Ethernet, using bridge mode, calling customer support, getting technical support here, but nothing has fixed it.

I have a 75mb download/10mb upload plan, but experience speeds as slow as 2mb for both. I can barely surf the internet.

I use the RDK-B Telephony Wireless Gateway Modem TG1682G (XB3) connected to my Apple Router with bridge mode. I am connected via ethernet.

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If 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 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 or sign up for their Service Protection Plan (https://www.xfinity.com/support/account/service-protection-plan/, about $6/mo) and keep it for at least 60 days. If the trouble is due to a faulty Comcast gateway device, or anything outside your home, you shouldn't be charged.