Was definitely a thing going on this morning, I experienced the same outage around 10am. I noticed as Spotify stopped playing after a track ended, then the e-call error and no signal. Not long later I noticed all was back to normal.
I have seen this happen before when there was an outage. Also happened briefly last year when they swapped the car's mobile IP address to be UK based and not Netherlands.
It could even be changes being made behind the scenes.