Just an FYI having dealt with Samba in the past all computers more or less do this at some point in time. Each computer wants to be the master browser and when you have a competition an election is forced, each OS workstation and server has an OS priority the higher the number the the higher the OS. So when an election is forced the server will win and all will be well. As Krizz told you to do, disabling it in the registry will fix that problem, but this is normal behavior.