Windows Small Business Server 2003 inaccesible on random Monday mornings

Hi,
One of my clients is having an ongoing problem that I was hoping someone can help me with. They have a Windows Small Business Server 2003 in a managed office/building and on some Monday mornings (only on Mondays, it does not occur during any other day of the week), the server is inaccessible; I cannot access it remotely, and users are not able to access anything server related.

I will eventually have to carry out a hard restart to get it working again, but because the client is at a remote location, we can’t see what’s happening on screen, and when we get back on the machine, there are no corresponding event logs. The issue reoccurred this Monday again, but with a slight variation: we were able to access the server remotely and carry out a soft reboot. I’ve gone through the event logs, and the only one was the following:

“Multiple domain controllers running Windows Server 2003 for Small Business Server have been detected on you domain”

I’ve talked to the person in charge of the broadband in the building, and they say that there is categorically no way another DC can access the network feed, they say that this must be occurring in my client’s unit itself, which I’m rather skeptical about.

I’m not sure where else I can go from here, but thought I’d post this here in the off-chance that someone may be able to help.

Thanks for your help.
granite03Asked:
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Vinchenzo-the-SecondCommented:
You need to check to make sure no one on site has tried to install another SBS on the network and join it to the domain.   Check the Domain Controllers OU in ADUC and confirm you only have the one present.
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granite03Author Commented:
Hi,

I've just checked, and yes, only the one DC is listed in the DC OU.
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Vinchenzo-the-SecondCommented:
What scheduled tasks are configured?  Being only Mondays the server is hanging is there anything running over weekend that can be causing this.
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granite03Author Commented:
Not that we are aware of. Full backups run nightly, AV and the like is being excluded over the weekend too. Is there anything else that I can do?
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granite03Author Commented:
Client was on a separate VLAN to other businesses within the same building, went and asked for support from the building's IT technician. They admitted that the VLAN's configs may not be working as it should be.

Don't know what exactly was done, but it's now resolved.
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granite03Author Commented:
Solved problem myself.
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