Some of my hikvision cameras are not working

alohaalex

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If I’m at home and my phone is connected to the wifi all the cameras work but when I’m not connected to the wifi only 4 cameras work and 6 don’t , sometimes all them work but the majority of the time I only can connect to 4, I use a switch to connect all the cams and they record to the sm cards. My IP address has not change, and the setting in all the cameras are the same except for the port numbers. Everything worked well for years but lately I have this problem. I Use the iVMS-4500 app (the lates version) and my iPhone has the latest software update. I deleted one camera and I added back but it didn’t resolve the problem. What do you think it could be?
 
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