I realized that it was just coincidence, because next day I have the same problem again: my D-Link DCS-935L camera was offline in mydlink Home, but at the same moment online and working fine in mydlink Lite (I observed the same behavior on phone with Android 4.4.4 and LTE connection and tablet with Android 6.0.1 and wifi connection). There must be some problem with mydlink Home app itself or mydlink Home app interface to cloud platform because my D-Link DCS-935L camera is online in mydlink Home now, but when I try to show its stream, mydlink Home app just restart itself and show nothing or just show dialog with this text "Sorry, we were unable to connect to your camera. Please check your Internet connection, then try again." But my Internet connection is ok, and mydlink Lite have no problem with connection to my camera in remote mode from my phone or tablet.
The mydlink Home app seems to me very immature, it doesn't work even as beta preview. Can anyone confirm these problems?
PS: If I quickly touch three dots in the upper right corner before app crash / restart itself I'll get to the camera configuration and there works only the latest item - Camera Information, so connectivity to the camera is somewhat working even from mydlink Home app.
PS2: Mydlink Home app push me notification about switching off my camera even when camera was shown offline in mydlink Home before, but it is curious that after switching off my camera when camera was shown online in mydlink Home and after getting that push notification about switching off my camera from mydlink Home, camera is still shown as online in mydlink Home. It is unbelievable mess.