We are aware of the continuing issues with the servers and are working towards a final resolution to prevent this issue from recurring. We understand what an inconvenience this can be and are working feverishly to resolve the issue once and for all. Your patience is very much appreciated.
-- The Tend Support Team
*** Update ***
As of 6:40 pm, Pacific, the server team reports that the issue has been resolved and that the service is returning to normal. We will be keeping a close eye to try and prevent this from reoccurring.