I have had problems with my 7604NI-K1/4P with two 4K 2085s particularly video stuttering but more frustrating I would lose the video on one camera when switching from the 2*2 screen to single screen mode. This happened after enabling the 265+ option for recording but stuttering also occurred in 265 mode. Searching the web didn't turn up a solution but there has been much talk of reducing bit rates and frame rates. Yesterday I updated my cameras to V5.5.61 and NVR to 3.4.98, don't quote me on those numbers but they were the latest firmware available on the Europen portal. But - the problems were still there. Tonight I seem to have solved the problem. The issue appears to be caused by the sub stream bit rates. So if the main stream is set to 265+ mode but the sub stream is set to 264, the sub-stream produces far more bits than the main stream. This seems to cause the hardware problems trying to decode the 265+ stream. Check what your sub stream is outputting, and reduce it and use 265 - not the main stream data or frame rates. Also remember the NVR settings override the camera settings e.g. frame rates. The 265+ bit rates are amazingly low !! I have set my sub stream to 2 fps, I don't use remote monitoring on mobile devices. I can now ramp up frame rates for recording the main stream and with no stutter and no problems switching from the 2*2 screen
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