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(New answer for clarity and readability)

I just looked through the trace files.

We can see a lot of Windows systems (both servers and clients) using outdated SMB configurations:

  • Clients (and at least a few servers) still support SMB v1
  • In the client network segment and in the server network segment we see frequent Master Browser Elections

The browser elections indicate a problem with at least one system. Could be a host based firewall / iptables configuration blocking incoming UDP 138, could be a faulty SMB implementation in a very old box.

Please get rid of SMB v1.

Or at least configure one stable system as master browser.