Katalon Studio should not close just because you lock Windows. Could you confirm whether it also happens when Studio is open but no test is running, and whether Studio is still listed in Task Manager after you unlock? If the process has exited, please share your Windows version, the approximate time it happened, and any matching error under Event Viewer → Windows Logs → Application. If available, please also send your Studio workspace’s .metadata/.logprivately through a support ticket (rather than posting logs publicly). These details will help us investigate
No, it is not about Win+L closing this katalon studio. Actually Version 11.0.0-1 had bug which was closing the studio of its own. I guess it would still present.
Solution:- Upgrade your katalon version to the latest. It is not present in the latest version 11.5.0