Yes that’s what I meant
The HDMI (ABDTuner, HDMI-for-channels, AndroidHDMI-for-Channels ah4c) solutions put next to zero strain on the server. This is because almost all processing is done on the individual devices (Chromecast, FireTV, Onn, generic AndroidTV) and whatever encoder device(s) is being used.
Chrome Capture for Channels, though based on HDMI-for-channels, is pretty CPU intensive as all the work is being processed on the server.
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After getting this same issue with a Firestick device too I decided to do a little digging. It turns out that because I "optimized" all my devices to reduce animation scaling to 0 that was causing a known problem. Putting my animation scaling to 0.5 solved this problem.
The reddit I used to fix this was Pluto tv app - banner overlays displaying permanently if anyone is interested.
Edit Update: 0.25 seems to work also.
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I'm trying ADBTuner with a previous generation, Fire TV 4k Max. It's almost working. If I enable compatibility mode, ADBTuner tunes the right channel and starts streaming from the encoder but it leaves the Fire TV stuck on the who's watching dialog. I thought that had been solved but perhaps Fubo changed something in their app. If I leave compatibility mode disabled, the Fire TV still gets stuck on the who's watching dialog but ADBTuner never starts streaming. The dialog eventually gets dismissed when it looks like ADBTuner tries tuning the channel again. It never detects playback, though, and gives up. I have logs for both cases if that helps.
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So I've got a 4 port encoder working well with 4 of the Onn Box (2023) Google TV boxes. The one issue I can't seem to solve is I need to enable ADB on the Onn Box but it kills my ethernet adapter upon reboot. If I disable ADB and reboot, the ethernet adapter will reappear. While this is more of an annoyance I can't quite figure out how to make survive a reboot. My Nvidia Shield separates USB ADB from Network ADB so I don't have the issue on that device. I've seen some people post success with Fire Sticks. I'd prefer to stick with something running plain Google TV as I plan to use YTTV as my channel source.
This is a definite issue with the onn box. I've seen it myself, and it's been reported here by others.
The FireStick 4K Max and Chromecast 4K with Google TV are the best choices with Ethernet. Both will even work with specialized PoE Ethernet adapters, which is my personal preference.
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In my early testing of ADBTuner, when I found out the ONN box disables ethernet in developer mode, that box was gifted to a friend, and I bought a Chromecast. 
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I encountered this issue too but have continued to use two Onn boxes via WiFi with no issues - one thing that I did to ensure WiFi was less congested was to keep a lot of the non streaming traffic on the 2.4G channels, use 5G for streaming, and I also made sure that all other tv streaming devices used for watching TV (vs. encoding) are using wired ethernet...
I'm using two ONN boxes via Wi-FI and the EERO access point is right in the same room with the rest of my office.
I notice that the feed starts quicker on channes than it starts on the preview video screen in the browser.
YTTV has been nice and stable and i don't have to mess with who's watching etc.
My two tuner setup is perfect for my needs.
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I’ve been using ADB Tuner for a couple months now, and I find that I need to reboot the Fire Stick quite often. (Every day at least) It’s one of the Fire Stick 4K Max devices. Has anyone had any of these issues, where the Fire Stick can’t, or won’t wake up?
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I do not let the FireSticks or Chromecast to go to sleep.
adb -s %device% shell settings put secure sleep_timeout 0
adb -s %device% shell settings put system screen_off_timeout 2147460000
I have 5 FireStick 4K Max devices connected to HDMI capture boxes. I put them to sleep after every tuning activity, and haven't had trouble with them waking up. They've been solid. Are you using the factory power adapters or equivalent?
I found, and tried the two commands that prevent the sleeping, but even after that, I can’t go 24 hours without the Fire Stick stoping responding to the ADB.
I I have no problem with my FireSticks going to sleep ... by any chance are you using WFI ? maybe it is dropping WFI ?
I started out originally by using the Amazon Fire Ethernet adaptor, but when I started seeing the issue, I switched to WiFi. Changing to WiFi didn’t help, nor hurt the issue. I’m going to switch back to the Ethernet adaptor today, and see if some magical miracle happens.
And… I assume you meant WiFi, and not WFI. (Water For Injection)
LOL .. Good luck.
Any recommendations for a cost-effective HDMI encoder that works with this setup?
Don't suppose there's any chance an HDHomerun Quatro can fill this role, can it? (Probably not, but worth asking).
Thanks.
No on the Quatro. The better encoders all seem to be a bit expensive -- but they're worth it in my opinion. What's really not cost effective is what a few of us have done, and that's to buy a single port encoder -- only to realize how sweet this setup is, and then end up buying a 4-port. 
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I would suggest the following encoder and ONN 4k Streaming box. You can use them with YTTV with little issue works great.
Exvist HDMI Streaming encoder
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Worth noting this though:
If you're using WiFi only this is not an issue. Just starting out though, I'd give the slight edge to the Chromecast with Google TV, even if it is a little more expensive. https://store.google.com/product/chromecast_google_tv?hl=en-US