Seems a recent MySQL and/or MySQL Workbench update has affected my Workbook sessions: if I've left Workbench open overnight, then when I try to read/write from/to the DBMS the following morning, I get:
Error Code: 2006. MySQL server has gone away
This necessitates me closing the Workbench 'Local Instance MySQL' window I was working on the night before and opening a new one.
I tried Edit>Preferences>SQL Editor>MySQL Session>DBMS connection keep-alive interval: 259200
I also added the Server System Variable 'wait_timeout = 259200' to my.ini and restarted MySQL.
Neither resolved the matter.