The datacenter that hosts our GRID and DV services is currently having a network stability issue. We have made them aware of it and they are working as quickly as possible to investigate and resolve the issue.
Update Friday 9pm EST:
Checking in with the data center this evening we see continued up and down status of our GRID and DV servers. This is a network related issue at the datacenter and it is being worked on currently. We have no ETA for a full resolution at this time.