I can confirm same issue with me - majority of stations are Win 7 and Win 2008/2012 Servers - all of them dropped workload almost at once end of Feb.
It is somehow comforting knowing that it is a common issue and they are working on it.
I also received first tasks today. The version is updated from 2007 to 2009. No more loop in the logs, it looks back to the normal working activity. Good news!