IDE is not functioning from time to time

Recently I encounter this more often. The auto complete suddenly stops working. Whatever I type, the IDE doesn't suggest anything. cmd+N doesn't generate new code. And even when I right click package and create a new class, it doesn't have any reaction. The only responding command is cmd+, to open the settings page. After the settings page is loaded and closed, everything goes back to normal. What is wrong with my IDE?

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