The Kodi.log and Kodi.old.log didn’t upload with the rest. Those are the ones that would show what file paths Kodi is trying to access. They may have been too large to upload so if you rebooted a couple times and then tried again that may resolve that issue.
I would try adding “vers=3.0” to your mount options and see if that makes a difference. They are currently mounting using SMBv1.
You might also try a normal Kodi path to see if the issue is also present connecting that way. By this I mean going to videos>files>add videos>browse>add network location>[put your NAS’s IP address in the server name field and you user/pass]>OK then click on the new location (smb://192.168…) and then OK and OK. When the dialog box pops up asking to set content click cancel or else your going to make a mess of your library. You can then just play from Video>files>192.168…> to see how it acts with Kodi paths.
We recommend people with 4K TVs set their user interface (UI) to 1080p. Kodi’s UI is not optimized for 4K yet and this can put unnecessary demands on your device and can lead to a suboptimal picture quality, as well as potentially cause other issues.
The settings we recommend are as follows…
Settings>System>Display>Resolution> 1920x1080p
Settings>System>Display>Whitelist> (empty) *
Settings>Player>Videos>Adjust display refresh rate> On start/stop
Some televisions may also need, or benefit from, the following being set…
System>Display>Force 4:2:2 colour subsampling> (enable)
With the above settings your UI will be output in Full HD and your 4K content will be output in 4K.
*Information regarding the whitelist can be found here. If you have any doubt, feel free to upload some logs so we can verify that your settings are indeed correct.