Server 2000 Event Errors

Hello – Does anyone have info on how to clean/prevent these errors from returning?
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EVENT ID: 2012
Source: Srv
The server has encountered an error.
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EVENT ID:8003
Source: MRxSmb
The master browser has received a server announcement from the computer TOSHIBA-USERBB that believes that it is the master browser for the domain on transport NetBT_Tcpip_{0EABB372-5264. The master browser is stopping or an election is being forced.
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Thanks everyone for your help!