title: Losing connection to device during start with Android studio
body: <p>I'm having problems with setting up my Mobile phone (Samsung Galaxy J5) to work as my Test-Device for flutter in android studio.
  I in-between managed to start my app on my phone but always lost connection after a while. Today it won't start up at all without any changes in the settings. 
  The output in the console of android studio looks as follows</p>
  
  <pre><code>Launching lib/main.dart on SM J510FN in debug mode...
  Initializing gradle...
  Resolving dependencies...
  Gradle task 'assembleDebug'...
  Built build/app/outputs/apk/debug/app-debug.apk.
  error: device '933fecf1' not found
  Installing build/app/outputs/apk/app.apk...
  Error: ADB exited with exit code 255
  adb: error: failed to get feature set: device '933fecf1' not found
  
  error: device '933fecf1' not found
  - waiting for device -
  Error launching application on SM J510FN.
  </code></pre>
  
  <p>I've seen the android studio losing connection to my phone while trying to install the app.apk. As the connection hasn't been steady at any point since I started getting in touch with flutter and android studio I guess there might be an issue with the adb but I have no clue how to track it down.</p>
  
  <p><strong>Flutter Doctor</strong></p>
  
  <pre><code>Doctor summary (to see all details, run flutter doctor -v):
  [✓] Flutter (Channel beta, v1.0.0, on Mac OS X 10.14.2 18C54, locale de-DE)
  [✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
  [✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
  [✓] Android Studio (version 3.3)
  [✓] Connected device (1 available)
  
  • No issues found!
  </code></pre>