On a V-core 3.1 : this printer has been printing over 600 hours since update to v2.1
Last print was on Aug 2nd.
I updated all after last print, left printer unused since then.
Switched on today, and get this message when sending a print :
Same Gcode sent to identical printer running v2.0.2-36-g230929e3 is working fine....
I attach the log