main steam live view black screen

[binh25]

I got DS-2CD2335-I hooked up to 7600 series NVR but my main stream sometimes gone black screen.
I sometimes has to cycle and power off the NVR and Camera to get it to work again
but the sub stream is fine, anyone know what is up?

 

[alastairstevenson]

How have the networking connections been done?

 

[binh25]

PoE connection for power and network, it looks like a reoccurring thing now it turns black screen every day after I dont know how long (as i dont look at the screen all the time) but within a day

 

[binh25]

Ok I got it sorted, I change the streaming protocol from UDP to TCP, I thought UDP would be more efficent but it ain't working
thanks for your help