Mine also!  After quite some time, myDLink displays "DCS-6010L" instead the user name (hostname) I changed.  In the mobile app, once "DCS-6010L" selected, it always report timeout.  While in myDlink website using IE, it prompts me to input password but entering it "correctly" just reports back an error.  Never experienced this since F/W v 1.11 or earlier.  With the same SSID set to other 4 different camera models, they never disconnect.  Don't know why it disconnects from time to time and need to unplug/plug it.  Hope that mine is not an isolated case.