DVR issue: Probing DNS

[sshadow]

I have a POE DVR with the cloud error 'Probing DNS' (should say connected)

• DVR is connected to the router
• 3 POE cameras are connected to the DVR
• I can see the 3 cameras on my router and ping the cameras from my PC
• Green and Orange blinking lights on the back of the DVR for network and Cameras
• I can't even add the cameras on my DVR even though I can ping them from my PC (they won't should up in the DVR search)
• I've opened ports on router for 192.168.1.9
• Tried DHCP and still not working

Issue is I cannot see the DVR from my PC or Router and also the DVR cannot see the cameras via the search feature.
This issue happened in the start then I played around with the DVR network setting and then it finally started working then all of a sudden Everything went into probing DNS mode again.

Has anyone got any recommendations?

Here is a quick video:

 

[Judgejules]

I have the same problem as above any help would be much appreciated