ProTools Playback Engine, ProTools Aggregate I/O "forgets" Inputs/outputs when disconnecting/re-connecting audio interface

This is happening all too often and it's driving me a bit nuts: when disconnecting and re-connecting the audio interface (same device, native to macOs Sierra) onto my Mac, ProTools Aggregate in the Audio Devices of the Midi Setup goes south.

The output/input gets duplicated and ProTools Aggregate gets confused, acting as if there is no device. On launching ProTools, cahoots ensues:

Duh!

In the picture below, the PT Aggregate I/O is configured normally, and everything works.

Now if I move the computer to another job location, by necessity disconnecting and re-connecting the audio interface, often there is a DUPLICATE and GREYED OUT input/output that ProTools Aggregate I/O is stubbornly set onto. Like an invisible, non-existent device. Hence it produces the Playback engine message above.

I wonder why this behavior? Is it PT? Is it Audio/Midi Setup? Is it the Mac? Anyone of you having this problem on your setup and can share some light?