No I believe you. Now the big question is why you see it and I am not. Are you able to try a clean build on an empty sd card?
i already created a small video, so here it is, maybe you see something that shouldnt be what i do not recognize because lack of skill 
first playback is the small video, second playback the big one to show a bit more of that behaviour
https://filebin.net/uh1nr7ce0zlt09ql/WhatsApp_Video_2020-07-06_at_18.23.42.mp4?t=1ekrlmkh
i use emmc but i can try to create either a new profile or a fresh install on sd
I am not sure I see it
Edit. Yes with the big file. But is it with the sample too?
yes it is the same with the sample, but as longer the file plays, the worse the playback gets. so on the small file, there’s only small “jumps” in the video and cracks in the sound.
i can also provide more of that file, maybe 200mb, if that helps?
did you turn on sound? because thats clearly to hear also in the short clip. sorry for the bad video file, its from an old samsung s3 (nearly 10 years old).
I heard the sound but I figured it is due to the cut of the Video.
I’ve tracked it down to a problem with resolution.ini
If I delete resolution.ini and quickly reboot the box before it gets rewritten then the box boots up fine in 1080p mode.
If I then change Kodi’s GUI to 2160p and reboot the box resolution.ini gets changed to hdmimode=2160p60hz and the box just hangs at a 4K version of the CoreELEC logo and I have to delete resolution.ini to get it to reboot normaly.
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I’m in the same boat as well, dropping my journalctl here: http://ix.io/2rbR
I’m also normally running in 4k, but the boot only shows a small 1080p boot screen in the top left corner.
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It does work but on reboot it does not display the Coreelec screen. It actually seems to load faster but goes directly to the kodi interface. On Odroid N2 Rev A
In my tvbox (S905X3) connected to an old 720p tv I have never been able to view the spashscreen image on boot, but Kodi has always worked.
For about a week, after a night build update i was amazed, during boot now I’ve seen the splashscreen image but when Kodi starts the result is what I place in the image.
Browsing with difficulty in the menus with the remote I saw that the resolution is set correctly (1280x720p).
Changing it to 720x576p and returning to 720p, or just only if i change the Hz from 60 to 50 the GUI returns to be correct, but at every boot the problem reoccurs.
If I delete the resolution.ini file and reboot I no longer see the splashscreen image on boot but the Kodi GUI starts correctly, I see well on the screen.
I tried to force the hdmi resolution in the config.ini but the result is the same.
The question is: what has happened since the last updates?
Is this resolution.ini really necessary? 
My resolution.ini:
hdmimode=720p60hz
frac_rate_policy=0
From the log:
2020-07-08 23:23:23.388 T:4059234320 NOTICE: Found resolution 720 x 480 with 720 x 480 @ 60.000000 Hz
2020-07-08 23:23:23.388 T:4059234320 NOTICE: Found resolution 720 x 480 with 720 x 480 @ 59.940060 Hz
2020-07-08 23:23:23.388 T:4059234320 NOTICE: Found resolution 720 x 576 with 720 x 576 @ 50.000000 Hz
2020-07-08 23:23:23.388 T:4059234320 NOTICE: Found resolution 1280 x 720 with 1280 x 720 @ 60.000000 Hz
2020-07-08 23:23:23.389 T:4059234320 NOTICE: Found resolution 1280 x 720 with 1280 x 720 @ 59.940060 Hz
2020-07-08 23:23:23.389 T:4059234320 NOTICE: Found resolution 1920 x 1080 with 1920 x 1080i @ 60.000000 Hz
2020-07-08 23:23:23.389 T:4059234320 NOTICE: Found resolution 1920 x 1080 with 1920 x 1080i @ 59.940060 Hz
2020-07-08 23:23:23.389 T:4059234320 NOTICE: Found resolution 1280 x 720 with 1280 x 720 @ 50.000000 Hz
2020-07-08 23:23:23.389 T:4059234320 NOTICE: Found resolution 1920 x 1080 with 1920 x 1080i @ 50.000000 Hz
2020-07-08 23:23:23.389 T:4059234320 NOTICE: Found (1280x720@50.000000) at 23, setting to RES_DESKTOP at 16
@roidy Can you try this testbuild with native 4K GUI and remove config.ini hdmimode:
https://mega.nz/file/955yRI7Q#v1qFC_SzT4uEFDTQ6xDVo2mlaDPTUiRvyQRcsZ-aMHU
The disable gui scaling option was moved under Display Settings.
Thanks
@Ray Yep, that works perfectly. hdmimode removed from config.ini, Kodi GUI set to 4k and Disable GUI scaling set to On, Kodi starts up perfectly.
Thanks 
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It also uses a native 4K GUI now on boot so if you notice the logo is never changed and there is no black screen on boot it just jumps from Logo to mediacenter GUI fluently. This is now for every mode.
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Yep, it’s now a very smooth transition from boot logo to Kodi, it looks much better
I gave it a try, connected directly to Sony ATV
resolution @ 3840x2160p/60 whenGUI scaling is off there is still a black screen during boot and before Kodi is up
When GUI scaling is ON, the default resolution goes into 720x840i and when changing to 2160p it comes a little bit stretched on the wideside…
After a 2nd reboot is comes on well, although CE splash screen appears twice on the screen… from 3rd boot on it works perfect, on reboot/splash and Kodi.
Will keep testing, though looks to be working well!
There should not be any black screen caused by resolution switch. What do you mean it changes into 840i?
When I enabled the GUI scale and restarted the device went on 840i resolution, so I had to change to 2160p and had to reboot to get proportion right as it was stretched
Strange. Using 4K with gui scaling should work exactly as before. What resolution did you use when you enabled gui scaling?
2160p.
It was always like that with config.ini hdmi mode as shared previously, so effectively 1080p on GUI
I mean before installing the latest dev build