Hi, I have a DS-7732NI-I4(B) with 21 cameras. The cameras are plugged via 2 x Hikvision DS-3E1518P-SI POE switches, and a Ubiquiti POE switch. A single network cable connected from the Ubiquiti switch into the NVR. When playback and even trying to view in live 'HD mode' on browser, I keep...