Emulator disconnect frequently and Android Studio Stuck. How To fix it?

What's your android studio version, jdk version, os?

What api are you targeting?

Can be a problem with new feature of android studio 2 instant run.

First try would be turn in off.

Be aware if you are targeting N Developer Preview is required to use Java 8.

More radical way is to rollback to android studio 1.5 and test.