File Commands In Mac

My version is on Mac Catalina. Has anyone reported a glitch with this version? After leaving the OS up and running, when I have a document open commands like Save As and Save A Copy do not work. Export quits too. The only fix I know that works for a while is shutting down the OS for a while and powering up again. Then, I can use those commands. Within the last couple of weeks I’ve had to do that twice.