Why does my DVR delete my shows?

My dvr had recorded shows from weeks, ago, days ago, etc. and now they are all gone.  I record shows and they save for sometimes twelve hours sometimes for 24 hours.   My series settings have NOT changed.  Contour deletes all my recorded shows randomly.  I recorded the Bruins last night.  It was there at 10pm, not there at 5:30 am.

My settings are set for "wait until I delete"

Any help? 

Thanks