I got an Asustor NAS that contain the files.
This isn't telling me anything. What OS is your server using, Windows or Linux?
So here is another log GTOP
Strange thing is i can ping it connect to it with putty but i can't connect back to my box in SMB.
And after a while the network comes back.
So there's nothing wrong with your network or the network interface on the LE client, but it sounds like your server is going to sleep and/or failing to respond after a period of inactivity.
No idea if you've configured your server to sleep/suspend after xx minutes idle, if so you may need to look at configuring Wake On LAN in Kodi Settings > System > Power Saving.
However if your server is running Windows, altering certain registry settings has been known to help smb (can't find them right now, could look if you confirm your NAS is using Windows).