After viewing today's clips for the first time, they are no longer available for viewing. They have dissapeared. Some of my past days thumbnails have become unresponsive. The progress bar stops advancing at certain points in time, then readvances at later points in the recordings. TP-Link Support engineers have suggested checking if the problem occurs when also using different phones or viewing different camera's clips. If the same problem does occur, then the problem obviously originates from their servers. 

This same problem occurred about 5 weeks ago. It is happening again. What is going on with the servers? Is this problem likely to resolve permanently ? I sure hope so.