Check the Roon requirements for a server, and ideally you exceed the minimum. As others said, check your network connections, if you have high speed, I recommend switches of 10/100/1000 and consideration to good built Ethernet cables.
Last, and optional keep your modem and wireless separate, and consider a Mesh Network, basic to install and supports 100% max connectivity using the proper amount of access points - high speed coming in better performs matching modems and wireless
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