If you get the same rejection a second time (or third, or fourth, or fifth...) and you see no mistakes on your return, select the file by mail option to paper-file your return. Sometimes, returns keep getting rejected even though there's nothing wrong with them, because you have transmitted to many times.
In these cases, we recommend paper-filing by mail rather than wasting additional time trying to "fix" something that is beyond your control.
For more on rejects see: https://ttlc.intuit.com/replies/3302275