What is NG?
Are you sure it are freezes or could it be that the computer goes into standby after this time? 15min are often the default settings for switching into standby and linux has problems with recognizing the computer as active while playing videos. When you go to setting>power settings>system/display you can enlarge the time until power saving functions will turn on or disable them completely.
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I would assume he means "No Good"
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Oh man....that would certainly make sense, as the last two failures were almost an identical amount of time. I didn't log the actual time before failure, but I did look at the clock on my other PC, and I would be they were both right around 15 min -- point being, very consistent, i.e., the same failure.
I'll give it a test at some point in the next few days and report back.
OK...back to laboratory!!!
(NG=no good)
Doesn't matter! It happened on my system, too. Until now I found no solution except turning power saving and screen saving options off. Regulary they start at around 15 minutes (that is the default setting) and always when I was streaming a video suddenly after 10-15 minutes the computer turned off.
Now I have turned power settings off because I daily watch videos on this computer and go manually into suspend when I leave my computer. So I have less problems.
I also don't want to be pushy or persuade you to stay on Zorin lite...But it would be a pity about all the time you have invested when your problems could be solved easily.
Welp....set pretty much all the suspend and related power settings to NEVER...and you guessed it...running fine all morning.
Doh!
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Super! I'm glad to hear this. 
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*** I consider the issue solved, but wanted to provide an update ***
Update:
Was able to run for 9 hours continuous yesterday (7/17/25) before screen locked up. But this time the screen lockup was really strange, hard to explain, like a ghost image of content and then another layer appeared over that. Point being, different than prior screen lock ups where screen just froze and mouse and keyboard became inactive.
Anyway, 9 hours is way more than I need and I've probably never run it for 9 hours straight streaming since I've owned it. Stated differently, I ran the sprockets off it yesterday. So we're good there.
After screen lockup
Restart #1: failed again with even more bizarre screen lockup (multicolored horizontal lines) after about 10 mins
Restart #2: failed again -- about 10 min
Restart #3: checked kernal (5.15) and made sure power settings ok, failed again --10 min...so I bailed for the night.
Starting to think there are multiple issues and after running 9 hours, specifically being temp related (very hot here yesterday, room was over 80F and terrible humidity)
Cleaned and re-pasted CPU this am, also blew out the dust (not much) from various nooks and crannies with canned air.
Doing two things different with today's run:
- Running kernel 6.8.0-60-generic
- Switched the Ethernet card from a upgraded one (forgot name/brand) I installed probably a decade ago and plugged into the stock Compaq Ethernet connection for this run
- All power management option still set to NEVER (essentially OFF)
- Current temps below (after running 1 hours, room ambient 76F, super low humidity):
k10temp-pci-00c3
Adapter: PCI adapter
temp1: 36.5 C
acpitz-acpi-0
Adapter" ACPI interface
temp1: 40.0 C
nouveau-pci-0200
Adapter: PCI adapter
temp1: 59.0 C
Best I recall these are temp levels consistent with what I've seen in the past. Unfortunately I did not check the temps last night when it was failing.
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Figured out that the most recent multiple failures with short run time (10 min) seemed to be due to Brave browser ad-block.
Updated Brave from 1.79.118 to 1.80.122 and all seems to right with the world
The whole mess boils down to the following three issues IMO:
- Some sort of conflict with the 6.8 kernel when I updated to Zorin 17.3 Core (possibly conflicting with my ancient Nvidia GeForce 210 GPU) -- downgrading to the 5.15 kernel seemed to have helped solve some issues.
- The default standby settings appear to have been casuing issues -- turning all power and standby related options to NEVER seems to have help solve some issues.
- Lastly, for whatever reason the Brave browser 1.79.118 version was causing issues with YouTube when trying to block ads -- updating to Brave browser version 1.80.122 seems to have solved that problem.
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Last Update (hopefully)
Decided to pull the plug on the old Zorin unit and send it out to pasture. Worked fine for awhile, but then started acting up again. So that's it...calling it done. Clearly multiple issues and conflicts, as elaborated above (only 4G RAM, older NVIDIA card, and who knows what other gremlins). Zorin still runs like butter on my 8G "not as old" PC, so that and the Dell referb I bought will be the setup going forward -- the Dell/Windows will be the streaming PC.
Update:
Tried install of Debian on the "old Zorin unit", result=NG. Died (the same old screen lockup problem) after about 2 hours of streaming on two different streaming sites -- so it's "probably" not a Zorin issue, it's a hardware issue IMO.
Decided to install Zorin 17 Lite on my "new" referb'd Dell/Win11. Not as easy as prior installs. Lots of messing around with things: disable fast startup, turn off secure boot, and other such nonsense. Never had to deal with all this mess on Win7 or Win8 installs -- anyway, after much fiddling around, up and running on the Dell with 8GB RAM (expandable to 32GB).
So nice to be back on Zorin. Windows 11 is an improvement over Win 8 from a interface standpoint -- stuff easier to find and layout more logical, but I still think Windows is a bloated dinosaur.