Cannot connect to ONE of our QC projects

We have an issue where we cannot connect to one of our projects in QC. We were working fine with all of our active projects just yesterday. Now, today, we have one project (databases are in Oracle) that people cannot login to. We see this error in the SA Log: Failed to reload the instance of the enabled extensions cache data for default_gemini_db@jdbc:gemini:oracle://qcdb:1533;servicename=QCDB(default_gemini_db) project.; Failed to obtain a connection to schema 'commercial_mercury_db' - timeout expired;