Long Term Data Collection

I had an interesting failure yesterday.  Something somewhere stopped working and my data stopped being recorded.  I have no idea if my devices stopped sending or Pachube stopped receiving but something stopped working.  This chart illustrates it:

The ... part is where data was not being saved.  So, there was a period of several hours where data just disappeared into a black hole.  My little devices don't have enough storage to hold something like that so I don't have a clue what went wrong.  Oh well, it's not like I can't interpolate the actual usage from experience, but it really is annoying.