Catalina Cubase 11 MacBookPro 2017 Bust External Drive

Since updating from Cubase 7.5 to Cubase 11 (very cool) in a MacBookPro 2017 Catalina (2 Thunderbolt 3 ports. Only. Seriously?) I notice my Glyph external drive stays very busy once a project is opened. It never stops once started. Any clues or insights?
Thanks!
~JC