Donh, both Local master server" and "Wins" are disabled. I'll try the stuff around smbstatus more and report here ASAP
Geaves, what you describe happened to me Friday: after rebooting both servers the issue disappeared. I just realized tonight that it came again
Ok, you tried that option in the smb conf file (smb deadtime - 0) on OMV, does your other server run samba? Mine did so I entered that in both smb conf files. @donh is correct in suggesting using wireshark. When everything is running smoothly the smbstatus will display what machines are connected and what they are connected too.....as yours is empty it relates to an error, possibly something similar to that on the bugzilla link.
Having set the smb log to debug this was part of the output from my original setup....
smbd: [2017/04/28 09:39:35.497405, 2, pid=31743, effective(0, 0), real(0, 0)] ../source3/smbd/server.c:443(remove_child_pid)
Apr 28 09:39:35 nas4free smbd: Could not find child 94592 -- ignoring
Apr 28 09:40:35 nas4free smbd: [2017/04/28 09:40:35.516441, 2, pid=31743, effective(0, 0), real(0, 0)] ../source3/smbd/server.c:443(remove_child_pid)
and this went on and on and on.......is there an option in smb to set a debug log? It may give more information. Be warned the debug option does increase resource use.