During the past few days, we've been having tremendous problems with RackSpace Cloud hosting both in terms of connectivity and guaranteed available resources. Since this wasn't the first time, we've decided to go through with the painful decision of changing providers, and we're very glad we did! We've now moved to DigitalOcean, and as of the time of this writing, I already see much better performance than RackSpace did on very similar configurations.
Please accept my apologies on any downtime you may have faced, it was completely out of our hands. The next 24-48hrs are still critical to make sure that everything has been migrated, and please let us know if you face any issues.