Win2003 DC DHCP stopped working

Win 2003 SP 2 DC, running DHCP for 6 months, today DHCP suddenly stopped working and none of my XP workstations can obtain an IP with DHCP.  If I go into DHCP it indicates that it is NOT CONNECTED.  In the Event viewer I see errors with MRxSmb event id 8003, saying that a workstation believes it is the master browser.  I've since taken 3 of these workstations offline and another just takes it's place as soon as I re boot my DC.  What on earth could be going on?  I'm totally stumped.  Thanks.
MaryMoynihanAsked:
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Computer101Commented:
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Windows Server 2003

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