Constant disconnections during long uploads

I posted over in Reddit about my issue and was told to do a DM over here. But I haven't posted anything here before so I don't yet have the option to send a DM. Anyways, here's my post from reddit below.

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Sundays have become my “no internet” day since moving to Colorado. 

I have a long running data backup to Backblaze that starts early in the morning and runs throughout the day. The setup worked flawlessly when I lived in Chicago—I was rarely aware it was running! But now that I’m in Colorado, I lose my internet connection several times during the backup window. My router logged 21 lost connections yesterday. Streaming an episode of Bob’s Burgers on Disney+ at the same time is unbearable.

I’m using the same hardware I had in Chicago. It’s an Arris S33 connected to a beefy UniFi Dream Machine Pro with a 2.5 GbE connection. My router does restart the modem periodically during the issue. The devices responsible for the backup and streaming are wired to my network.

Anyone else run into this problem? Anything I can try?

Things to callout from the screenshots:

• The purple line on the graph is data being uploaded to Backblaze.

• The blue line is download. I was streaming something Saturday night starting at 8:45pm.

• Yellow line is average latency

• On the left side, you'll see 1560ms, 1496ms, and 1447ms. Those are ping response times to Microsoft, Google, and Cloudflare.

• 117GB of traffic during this period. Backblaze accounts for 105GB.

• The other screenshot lists the connection state changes. I don't manually reset anything.