ds-7104ni-sl/w

Hello Everyone! :peaceful: I'm new in cctv world, and i feel lost because i have a little but huge problem with 2 cameras from 8 meters from the NVR and the signal is so poor that produce lags in video an audio (video freeze and audio lost). The NVR is Wifi - Hikvision DS-7104NI-SL/W and 4...