Hello rfclad ,
This “EA server is unable to process request” error appearing at the end of a match, is most likely caused by the security limit. This is a common issue.
The security limit can trigger if too many matches are played within a short period of time, especially if several matches are quit early (for example, leaving multiple matches after going 1–0 down).
In this situation, I recommend playing the full 90 minutes. In some cases, you may also need to wait up to 24 hours before being able to play normally again.