(PC) You have lost connection to EA Online/Servers

I have experienced this issue as well. The usual response is to check to see if the necessary UDP/TCP ports are open. If you are playing on a PC and a recent version of Windows is your O/S, then those ports are usually opened by the application that needs them. I was getting the "you have been disconnected from the session" problem. The usual help response is to check the ports. This did not help me at all. I open up the suggested ports (both UDP and TCP) to no avail. What worked was uninstalling Origin altogether and re-installing it. But, I do get this particular error message from time to time as well. This is uually not related to Windows opening the correct ports or a firewall blocking data on those ports. Most firewall programs will inform the user if a application has been blocked. And the user has the option to allow access. Sometimes clearing DNS entris can be helpful. One must use the "IPCONFIG" and "NETSH" command line prompt w/admin level access to accomplish this. Resetting one's router may also help. If these steps don't work, then it is most likely a network issue upstream from the user's host machine. Possibly a TTL issue with the routers on the pathway to EA's servers. Which would help explain why it is an occasional issue rather than a persistent one. If it is persistent then one may want to contact their ISP.