After upgrading to Android Studio 2.2, adb will disconnect from my devices after a few minutes (~ 15 mins). I have to either re plug the device or disable ADB and renable every time. It happens with all devices. This is on MacOS Sierra. Is there a timeout setting they have added?
The issue is with ADB and it is reported in the bug tracker: Issue 219085: adb does not work reliably on MacOS Sierra.
Answer from the thread:
The fix has been released in the Beta Preview Channel, we apologize for the inconvenience.or more information on how to use the Beta Preview Channel, please consult http://tools.android.com/download/studio
Upgrading 2.2 to 2.2.1 or uninstalling the Android Studio-2.2 and installing the 2.2.1 won't work. Try to do clean uninstall by following the thread How to completely uninstall Android Studio? and check.