Query field names renamed to Expr1

I recently had things quit working in a newer Access database that has been stable for several months.  I tracked it down to field names in the queries changed from a name to "Expr1".
Behaved like this topic:
https://social.msdn.microsoft.com/Forums/office/en-US/b92d559b-2ce3-4b37-9939-a2a519b3429b/upgrade-from-2003-to-2010-causing-query-column-name-problems?forum=accessdev
It's in Access 2010 and I did not upgrade, and I did not change any linked tables.
I'm wondering if it had anything to do when I did a Compact and Repair on the database.
Per other articles I have unchecked ALL boxes under Access/Options/Current Database/Name AutoCorrect Options
Thanks for any help you can provide!

I had a backup copy so this morning I went through all the queries and found the Expr1 and changed them back. I had no calculated fields, and I didn't change anything in the queries. (I added a new and different query, but that was it.
Didn't touch any other queries, and this happened in all the other queries.)
My main concern is not knowing what caused it, and preventing it from happening again. I'm hoping removing the Name AutoCorrect prevents that.
I appreciate the reply. Thanks!

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