I'm wondering why you expect they gonna fight for you to fix your issue? On my issue I never get reply from support and chat option Agent is disabled.

@skyfx64 that device what is connected to Ethernet port 4 has 100Mbps speed set. Can you check what is set for other router to use LAN speed? On your router go Advanced > Network > Internet Go down...

If you have some hints or suggestions please shared with people.

Hello, I replaced my existing Linksys router / mesh network with TP-LINK Archer BE550 | BE 9300. Wifi works perfect, wifi coverage is perfect as well. Before I had mesh network to get normally...