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iPhone 12 Max WiFi speed issues

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iPhone 12 Max WiFi speed issues

I've run the xfinity speedtest on my iPhone 12 Max several times, and I'm getting much slower speeds (<30 Mbps) than my iPad or MacBook Air (100Mbps+) which are all on the same network. 
Tried all standard troubleshooting (restarted modems, restarted phone, reloaded phone iOS)

Tested phone on other home networks; it got downloaded speeds of 100Mbps+, so not the device.

Only thing I can think of is firmware upgrade to router? Thoughts?