Just wondering out aloud rather than floating any theories, if it is in any way related to the 6.4 magnitude earthquake and/or geological events leading upto it. Also inter/un-related, Google provides Apple with the infrastructure for iCloud; they also experienced some downtime in the last few days, along with others i.e. tremors causing some sensitive/critical servers to misbehave.

However, I doubt that it is down to these factors, as there will likely be significant amount of distributed fault tolerance, failover and contingency plans in place.

https://earthquake.usgs.gov/earthquakes/eventpage/ci38443183...