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Antivirus - Windows 7 high memory usage due to SophosFileScanner.exe

Since yesterday night several Windows 7 O.S. was affected by high memory usage due to SophosFileScanner.exe process.

CPU usage was constantly at 100%.

Sophos support indicated that problem was due to this reason:

  • During a staged roll-out of an updated machine learning model, customers began reporting excess CPU usage.  As it became apparent that the performance issues were related to this silent update, the decision was made to roll back to the previous version. 
  • The problematic model version identifier is 20230629.  The rolled back version is 20230202.  The rollback should be completed imminently.