Lost pop-up menu with auto-completion code: 
When typing the studio does not offer anything: 
How can I get it back?
Delete the .idea folder in the project root. Then reopen the project.
You have a force majeure, in principle, this should not be. In my entire history, the use of IDE from jet-brains this happened only once (the disappearance of auto-completion). I do not think that you will have this incident repeated several times a day. To prevent a repeat of your particular case, you must first get to the bottom of the cause, only you can do this. Therefore, you can just remember about .idea :)
Uncheck File -> Power Save Mode
Source: https://ru.stackoverflow.com/questions/495644/
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