No, I don't think that would fix it. I'd pull the second router and eliminate that as an issue. Having 2 misconfigured routers on the same network is going to cause problems.
Start as simple as you can, Hitron-router. Bypass the switch and plug any ONE of your upstairs cables directly into the router. Go upstairs and see if that port works.
Just had a thought...if you plug a network cable into a switch, and it loops somewhere else...say someone has plugged a cable from one port into another that can reek havoc. Or someone pounded a nail through a wire and is causing a short, or wired a port incorrectly. A surefire sign of this is all the lights flashing away on the switch, in snyc with each other. So as suggested, bypassing the switch should solve that.
If you can make the simple network work, unplug everything from the switch, and re-connect one at a time. You should be able to pin down where the issue is. If you can't make the basic setup work, try new network cables.
And if your network is showing 3 and you only have 2, you may want to just factory reset everything and start from scratch. Starting with one...
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