EA_Shepard
So I did a little more research on my assumption that team data is not queried when accessing the menu.
I invalidated my lineup by removing my QB1. I then went into the “Solo Seasons” menu to see if I got message about my invalid lineup at this point.
I received no warning. This leads me to believe my assumption that user lineups are not causing this issue
Upon trying to launch game from “Solo Seasons” menu I got message about invalid lineup.
So if this error was due to user line up issues it would occur at game launch, as that’s when your team data is queried.
When the error happens, I assume the team data on server is being queried. I have already reported on issues with the team data on your servers in this thread.