I can't live view on the app anymore??

[Capital_Singer]

I noticed the other day that I can't live view on my app anymore, this is the first time I've noticed and It doesn't seem to coincide with any modifications I've done to my network or CCTV system

I know the NVR is connected to the internet as I get notifications of smart events on the app(and I can view them), but if I click on a camera it just shows the loading bars and then times out. it says "device streaming timed out, check the device or network connection"

any ideas?

 

[Capital_Singer]

update:
searched online, found this Why can I no longer see my cameras on my phone? and tried steps 1-4
now when I open the app it says device offline.
tried to revert back to original settings, I think all i did was uncheck and check some boxes, It's still not working