Roam 2 Does Not Power Off

I purchased a new Roam 2 last week; connected it at home and it worked fine.  Brought it with me to Berlin, connected it in my hotel and worked fine for several hours.  Returned later in the evening and now there is a steady orange blinking light.  The Roam 2 is not on the system I set up and can’t be located.  I have tried to do a factory reset, but it will not turn off.  I've held the power on/off button for 5, 7, 30 and more than 60 seconds.  It still blinks orange.  It’s disconnected from any power.  Still blinks orange.  Cannot fathom how to turn iii off,  it doesn’t play, responds to no other attempt with any buttons.  It just blinks.  Slowly mocking me.  Using Sonos branded charger/usb connector.  What gives?  Very disappointing as looks like no music for rest of this 3 week trip.  ANY IDEAS????