Hikvision camera times not syncing in ivms

[cavcom 0]

I have a DS-9632NI-I8 that has major delay when viewing over IVMS, the client computer is on the same Lan and is new and high powered, cat6 cabling throughout with about 20 cameras , I have tried everything Hikvision has told me to do, what happens is when we bring up the cameras in Ivms it works fine but after time delay will start to buils and the cameras can be as much ad 30-40-60 seconds off from one another, same with the delay. The cameras connect to a 24 port Hikvision switch, that switch is connected to another switch all on gigabit ports, I also have a 32 port ST nvr next door which connects to same switch over fiber and that those cameras seem to be fine all with in a second or 2 from one another, all nvrs and cameras have latest firmware. I have lowered the I rate on the cameras to match the frame rate , im out of Ideas and will be swapping the nvr out soon.