Why android studio autocompletes stops when using Future keyword in dart - android-studio

I use Android Studio version 3.6.3.
I'm building an app using flutter.
When I type Future keyword, Android Studio autocompletes stops. So, I have to restart the Android Studio.
Sometimes, I should restart it several times. I don't know how to resolve it.
Is there anyone who can help me? Thanks for your help.
Sorry for my English

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