I observed that the Mount folder on QMC disappears occasionally and all document disappears from access point. My mount folders are shared paths & QV is running on win 2008 R2 server.
Try a UNC path vs Mapped. Mapped drives can get dropped very easily. QMC cant re-connect to Mapped automatically.
the path is already UNC !
You may want to send a screenshot of your QMC config for community to look at. May have hidden clues.
the page with mounted folders etc...
Retrieving data ...