So my friends and I have been making our servers for a pretty long time now, and usually my friend would run a basic minecraft server because my modem has issues with port forwarding, not important now. We wanted to play Ptoject Ozone 3 which is a new modpack for minecraft, and since this modpack compared to the previous one eats up even more ram and system rescources I decided to take my old PC and put the server on there. Since my port forwarding wasn't working we decided to use Radmin VPN since it is the easiest solution. I managed to set the server up, and my friend can join, but every little while he just gets disconnected and it appears like there is no server. it isn't the server stopping all together, since I don't get kicked, and when I was playing with multiple friends only one of them gets kicked at a time, not both. If anyone has an idea how to fix this it would really help, thanks.