In the case anyone else runs in to this issue I have been having trouble connecting both of my Teslas to my home WiFi. I tried a clean Guest network to avoid the known DLNA issue and still it had problems. It turns out what was causing the issue was that I have a VPN set up in my router using OpenVPN that I use when traveling. Even though the ports used are different than the Tesla VPN and I have no clients connected to my VPN, it seems the service conflicts with the Tesla VPN connection and if I turn off my private VPN then my cars can connect to the network and stay connected without a problem.