Connection with a server or service is lost

I have small network setup with Mac OS X as the server and around 6 clients (mix of PC's and Mac's) authenticating from OD on the server. Since last week I am getting this strange error from server admin "Connection with the server or service is lost. Contact the n/w administrator or try log on again.". I get this error message every morning and none of the server features can be accessed including the log in to the network which fails on all the machines. Everything will work fine when I reboot the server.
So, I wanted to know what is causing this problem & how to go abt fixing it?

I can confidently rule out the possibility of an intruder interfering with the network.
Who said "intruder"?
So there is no malware on the local client and server boxes, nor on any printers, nor on any WiFi widgets or managed switches or other network infrastructure, and there are no unauthorized wired or wireless connections? That's a very rare achievement. Congrats; most excellent work! (It's probably not malware, though; it's more likely some authorized activity or authorized person and not malware. Though yes, it could be malware.
As for the disconnection here...
This could be building cleaning crew borrowing an electric outlet for some of their cleaning equipment. Unplug router, plug in the cleaning equipment, clean, plug router back in, leave. Or some helpful security guards shutting off a power switch or a breaker as part of the nightly rounds, or any number of other variations, too. A vacuum cleaner running across a damaged network cable, or a glitch or sag or transient caused by a high-demand electric device changing its power state.
Find out which widget (router, switch, firewall, whatever) is involved and work from there.
Also look for traffic spikes and other such; for odd network traffic patterns.
Scheduled reboots of network devices or such?
Hardware problems?
Also look for time-out programs and idle activity monitors and related; these are rare on Mac boxes, but have been seen in other environments, and have been seen on various network servers.

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