I'm not sure what you mean. What is not working like it should? What was the gpu usage before?
We use the same nv transcoder as Plex, and all the work happens in the nv driver.
when I first installed the card I was getting 60-70% GPU usage which was allowing me to transcode at 3-9x
now i max out at 10% GPU which barely keeps me at 1x which causes pausing during watching.
On live or recorded playback?
Does the Log show it using h264_nvenc?
Both
2018/10/24 22:02:25 [HLS] Starting transcoder for channel 35 from 166.173.60.254 (encoder=h264_nvenc, resolution=720, deinterlacer=linear, bitrate=2000)
I don't know why it would be working fine and then stop working. Only thing I can recommend is updating the nvidia driver since that's what powers the transcode.
Does Intel Quick Sync work?
I've just bought a Asrock j5005 and was hoping I could run the DVR on that machine with quick sync with transcoding capabilities
I just removed driver & reinstalled still doing the same thing
That processor may not suppprt quicksync as I donāt see it listed as having quick sync:
Also doesn't show Quicksync on the processors ARK page. Normally "Intel Quick Sync Video" field would be listed directly under the "Processor Graphics: OpenGL Support" field.
It does support it. Still don't know why its not on that list. My question wasn't about about that tho 
I was actually looking into this myself. Intel does not list Intel Quick Sync in its ARK feature list, but I'm reading articles everywhere that all Gemini Lake CPU's do?! So maybe it's not listed at all because it's a standard?! The iGPU is Intel UHD Graphics 605.
So does HW transcoding work well with ChannelsDVR, on this CPU???? I'm currently using UNRAID on an old desktop with an i5-4590 CPU. Though that may be more powerful, it is most certainly not so power efficient, and is such an eyesore!
How well does this CPU work, if it is SOLELY purposed for ChannelsDVR only, with an HDHOMERUN Quatro tuner?
I just wanted to report back that I have simultaneously ran six streams using my Nvidia P2000. Worked amazing.
30% CPU
25% network
20% GPU
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What are the resolutions you have them running at?
The Apple TVs are all running at original on the network and the remote apple devices were 720p 2 mbps for that test I referenced. 3 Apple TVs and 3 Apple devices.
DVR doesn't do transcoding for an Apple TV at original quality on the same network.
Ah great note. I will have to revise my stress test then.