Peace, friends. Sirrian and the team posted recently the reason for the service disruption here in the Official News forum:
And they discovered an issue which has affected users on ALL platforms, which the devs are working on fixing.
Please cut them some slack, Sirrian himself stayed up all last night to monitor the server situation. Do keep in mind that the level of customer Support for this game is possibly the best you’ll experience anywhere. 
But do keep reporting any new error issues that pop up. Nobody here is a mind-reader after all.