Users of Amazon's Alexa complained that the voice assistant was not working on Friday morning.
According to the website Down Detector, the problem appeared to affect the UK and parts of Europe and lasted about an hour.
Some users posted on social media that they had been unable to get Alexa to respond or help with their morning routine.
Amazon has not yet posted about the problem.
Alexa powers Amazon's Echo smart speakers, which launched in 2014.
BBC Click presenter Lara Lewington said she had been unable to turn off her morning alarm because the voice assistant was not responding.