Please tell us what Pi you are using (2, 3, 4), what image you have installed (stretch, buster, ..) and what Max2Play version. Have you made any special settings in your router, e.g. port forwarding or are any ports blocked?
Download “Max2Play Raspberry Pi ALL incl. Pi 3 & Pi 4 (SD-Card Image based on Raspbian Buster)”
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I don’t think there has been any change to the ports, but i do have a DNS content filter
My current setup has my router connected to a switch and the switch the the Pi
I tried connecting the Pi directedly to the router, and it worked fine. But the router is not in the right location.
Can you deactivate the DNS filter for testing? How long is your Lan connection from switch to router and from switch to Pi? Does the problem also occur when you use our Stretch Image instead of the Buster Image?