Its a bug with network communication between you and the EA servers. It can be a really big problem sometimes. The best thing to do is restart Origin when that happens and try again. If it really wont let you play a full game check what data center its giving you and ALWAYS pick the one with the lowest ping. Also, faster net speeds do help prevent this. Still, you're not the only one with these issues. I have very good internet and have had issues with this as well. Still, check your data center sometimes it isn't set to the lowest I had to change it a couple times cuz it changed on me before.
