Connection keeps dropping after speed upgrade

Hello!

I posted this on Reddit, but redirected here to do a direct message.  I don't have a post created yet, so creating this one so that I can do a direct message.

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Our connection has been randomly dropping since we got a speed upgrade a month or so ago. It seems to occur a bit more frequently when more devices are on the network, but it still happens when one of us is working from home alone.

I've gone through the troubleshooting assistant many times, and it's found no issues. Should I can to have a technician come out or is there an easier fix we can do ourselves?

Many thanks!

Follow up details from the Reddit thread:

I've run the diagnostics from the app several times, and when everything is working well, it reports no issues. The best way to fix the issue is to reboot the router. But sometimes we're rebooting the router multiple times a week. Sometimes, the issues seem to resolve themselves if we're both too busy to reboot the router. We're using Xfinity provided hardware.

I just checked the cable connections, and they're all finger tight.