I think I found what my issue was.
The password for this user/database was changed over a month ago, but I never made the correction in the data source. When removing the SQL data source with the wrong password it works correctly again.
In UIM/OC 20.3.1/20.3.2, I did not have the problem that ALL my SQL tables stopped working across every dashboard just because I loaded the one with an incorrect password.
/Kenneth