Network clients can't log in some days...

but can on others!
Since upgrading to Mavericks and Server 3 I have an issue with local network clients not being able to log in to their accounts some days but can on others (yesterday was fine, today a problem again).
It seems that quite a few people are experiencing similar issues but I can't find a solution I am confident to try out or that replicates my situation.
Before you tart throwing techincal advice at me, I am not a networking expert nor a Mac genius, so please make your explanations clear and simple. Thank you.
I have tried rebooting the server and clients, no success (today - although three days ago that did work);
I have 'unbound' and re bound the clients (which worked four days ago, but not today - they are still showing green light);
I have verified the disk permissions on the server (there were a few errors all bar one are corrected).
Any other (simple) suggestions? Even if it is just things to check and to post more info here to help diagose the problem.
Many thanks in advacne.

I'll try to keep this simple, but network troubleshooting sometimes... isn't.   This reply will also probably get a little wordy.
There are three parts here...
First, ask the server about its own local network and DNS configuration.   Functional networking and proper local DNS being fundamental to how servers work, and how servers can authenticate with your remote clients. To do this, launch Terminal.app from Applications > Utilities and issue the following harmless, non-destructive, diagnostic command — this command will spot most of the issues that can arise with local networking and local DNS:
sudo changeip -checkhostname
The sudo will require entry of an administrative password. There may be a one-time warning displayed about the perils of using sudo. The command will then display some local network configuration output (including the IP address of the server), and finally an indication that either no changes are needed, or that there are network or configuration or DNS errors.   If changes are required, post the output. (If you want or need to obfuscate, please do so consistently here, and please switch the domain part of your host names to "example.com", "example.net" or "example.org".)
Second... On the client systems, launch System Preferences via  > System Preferences..., select Network, select the network connection (WiFi or Ethernet, most likely) that you are using, then select Advanced..., then select DNS, then confirm that the clients are referencing only the IP address of your local OS X Server or whatever DNS server you are using on your local network, and that your client systems are not referencing any ISP DNS servers, Google DNS servers, nor any other DNS servers that are not on your local network.
Third... Please also describe your network configuration in just a little detail.   For instance: are you using an all-wired Ethernet network, or are you using WiFi, or some combination of WiFi and wired networking?   Are you using a firewall? Any network switches? Do you have more than one switch?
If you are using WiFi for your connections, are you located in an area where there may be nearby WiFi networks?

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http://i42.tinypic.com/dyoupu.jpg
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