Hello,
I am having similar issues. I tried everything even the best ovr lineup. In my mind what seems to have caused my issue is opening packs and adjusting my lineup prior to the starting Joe Burrow tasks being completed. I still have bugs on those tasks and they are not recognized as complete.
My fix was creating a worst ovr lineup manually. This allowed me to play challenges but you can see the problem wothba 66 ovr.
Recently I earned the new Gronk and Steve young amd added them to my worst ovr. I was still able to play.
I now think one of my player rewards is corrupting the lineup amd will try to add my best players one at a time and try to play a challenge. This should result in finding the player causing the issue unless of course its a combination of two or more players on the same lineup causing the issue.
Are there any know cards that cause a lineup crash fort I can lookout for?
Thanks,
The5thAce