Apple is rolling out a firmware update for the MacBook USB-C Multiport adapter, which improves the compatibility and reliability of affected adapters. These come with the Apple USB-C Digital AV Multiport Adapter or Apple USB-C VGA Multiport Adapter.
According to Apple's support website, this update incorporates the next:
"The USB-C Multiport Adapter Update 1.0 improves the compatibility and reliability of your Apple USB-C Digital AV Multiport Adapter or Apple USB-C VGA Multiport Adapter. This update is beneficial for all customers."
Enough stated, in point of fact. If you have not won an update notification, be sure your adapter is as it should be plugged into your MacBook and that you are rocking no less than OS Y El Capitan v10.11.4. Be positive to have all exterior units disconnected from the adapter sooner than you kick off the update procedure.