This was a sudden incident that happened on the same code and infrastructure we use for years. Basically, docker refused to restart our worker containers on one of the servers. We've implemented some policies to be able to overcome such situations in the future. We will release this tomorrow. We don't expect the same thing to happen now again.
If you decide you stick with the original cheaper plan, please email me your account name to firstname.lastname@example.org and we will refund you the previous payment.