The types of issues you're seeing are indicative of fried ram or disk due to power outage or spike. Maybe there is some sort of RAM test on the QNAP you can run.
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Thanks for some new tips, I’ll investigate.
On my test I was running from web UI, I increased buffer but it didn’t seem to help (was @ 30sec now at 1 min)
What I meant is to increase the web-player bitrate, like try setting it to 1080p 8mbps, which is higher than TVE. So TVE will just remux instead of transcoding.
Sorry for the confusion...
On post: The buffer info was based on my initial test...just a further FYI. And thanks new for tips.
PLANNED to try the bitrate tip later 
Changed bitrate to 1080p @8mbps:
Glad to see remux, however, same problems as before. Maybe not as pronounced but these are just quick tests.
Oh well, I was really hoping that it would alleviate...but back to the drawing board. Still maintain the belief that the CPU is just too underpowered vs @tmm1 failure opinion...but at this point, it’s moot.
Bottom line...need a better solution.
@djcastaldo Thanks for all of your help. And also @chDVRuser
CC: @tmm1 ... can see your 
The issues you're seeing are not playback problem, but during recording. If you play the file with VLC it will show the same corruption. Recording uses very little CPU, so unless your QNAP shows 100% CPU usage due to something else it is unlikely to be the cause. My TS251+ has an even slower CPU than yours (J1900 vs N3060) and is fine. We also have users running on RPI2 with very little CPU available and no problems.
Can you try recording from ch6774 CMC and see if the recorded file has corruption. (Show in the Logs in [MTS] entry as well, or via playback in VLC or other player).
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QNAP is supposed to have a Memory Test Diagnostic app but I can't find how to install it: https://appcenter.qnap.com/eng/qpkg/overview/diagnosticApp
The other way to test RAM is more complicated: https://wiki.qnap.com/wiki/Memory_Test
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Major stuttering tonight, first time ever. Was having trouble on all streaming. Rebooted router getting 80 down consistently. All other services are working fine.
Edit. Probably because I’m recording 4 things and processing 2
Since you are also having problems with ATV4K/iPad...
If your modem is separate from router...I’d also reboot modem.
I removed plex live tv from Nvidia Shield and moved my channels data to seperate mount drive.
I see improvement and no issues now.
Yes, I have a separate modem/ router. My issue is the channels DVR front end keeps losing connection to my Apple devices and defaults to an out of home stream.
I received a support email from another user on TS-251 J1800 who is having the same issue with skipped=XXXX causing corruption.
I did some more tests on my TS-251+ J1900 and still cannot reproduce the problem. I am now running QTS Beta 4.4.1, which could be one difference.
@DebbieFL maybe you can provide remote SSH access to your QNAP so I can run some tests on the device. It's possible the other user also has a hardware issue, but perhaps there is an edge case software bug only triggered in certain situations.
Gladly!
What’s best method to set this up?