Lots of complaints about the timing. But Cryptic's a business, being down like this hurts them more than it hurts you. Not to mention paying their engineers to work late on a Saturday night.
So why now? I'd say odds are some of their networking hardware wasn't expected to live through the night, or much longer at least, without replacement. Better to bring it all down in a controlled way, swap out what needs to be fixed, restart it and test it before turning the nerd masses loose on it.
They may have ordered the replacement components after the first unscheduled downtime a couple of days ago, and outlined a plan then to make the fix Saturday night. That might be pushing the definition of "scheduled maintenance," but the alternative could have been worse.
Or maybe Cryptic tried to be cheap and fix the problem in other ways first, and this is the last resort when inexpensive fixes failed. Either way, if this truly fixes the problem (which remains to be seen), it will be worth it.