please, let us know NAS this is, model, brand , firmware version, etc.
I strongly support Tom’s suggestion to use kernel smb code with the fstab configuration instead of the smb implementation of the kodi mediacenter.
In addition I’ve to further ideas:
If you’re still using the mediacenter smb access, you can influence the maximum SMB protocol to use namely SMB1, SMB2 and SMB 3 at Settings -> Services -> SMB Client -> Maximum protocol version. Please, try all these whether it makes a difference with your NAS.
Edit the file /home/osmc/.kodi/userdata/advancedsettings.xml and insert the xml tags <advancedsettings> ... <loglevel>3</loglevel> <debug> <extralogging>true</extralogging> <setextraloglevel>32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536 </setextraloglevel> <showloginfo>true\</showloginfo> </debug> ... </advancedsettings>
reproduce the issue
upload the log set using grab-logs -A or the MyOSMC method in the GUI and provide the URL, here
remove the added code from /home/osmc/.kodi/userdata/advancedsettings.xml
go to Settings -> System -> Logging and Reset to Defaults at the bottom