This is 99.99% unrelated to Unreal Engine.
No actions can be taken on the folder.
All mouse and keyboard actions do not work.
This is a very peculiar behaviour.
- best case scenario: antimalware / antivirus is acting up and throws false positives the system is trying to quarantine
- worst case scenario: hardware failure, faulty RAM corrupting data and writing it back to disk can create bizarre scenarios - have you seen any blue-screens lately?
Open the Task Manager (ctrl+shift+esc) - any processes that seem off during the episodes? Hogging CPU / Memory / Disk?
And after a certain period of time, the folder is turned off and Windows blinks once, making it impossible to run the project.
What does it mean that the folder is turned off? I realise this is a machine translation error - what happens to the folder, it is deleted? Files are missing? How does “impossible to run the project” manifest?