I have a DS-7608NI-K2 / 8P (firmware V3.4.103 build 181226 ) running for about 1 year then on august 15, the device no longer saw any of my 5 hikvision IP camera. which are :
2 x DS-2CD2732F
3 x DS-2CD2155FWD-I
On the camera status page, all 5 camera had the status of offline in the NVR...