I got “Error: Builder disconnected” message several days ago when I was playing with my test device.
The app was built but not deployed. I have tried one more time and got the same error. When I tried a bit later with absolutely the same code the build was successfully deployed.
But this is not the worst. The whole 600+ megabytes app was downloaded again by the device. It is ok if I use this device with fast and cheap internet. But I am planning to use my devices with 3G modems. Bandwidth is limited. It is absolutely not acceptable to download the whole application each time the builder disconnects.