hmm..Well I'm glad the problem has vanished for now.
Normally, when multiple machines are connected on a network, they will 'discuss' between them which one is the Primary domain controller. The PDC is usually determined by the date/version of the OS and the uptime of the machine. Example: NT machine wins the election over 98 machine; XP wins over NT, etc. BUT if you've got all of them as XP, it should be based on uptime alone. However, I'm assuming you're using a peer-to-peer networking system (as opposed to a server-client setup) and so you don't need a PDC. I'm guessing there was some weird glitch due to machines rebooting in weird orders or something (total guess) so an election was forced and combine that with the fact it's wireless so they may have had a hard time finding each other, and so you got the error.
One thing I've done is, when having problems with the machines over a network, is to make sure I don't reboot them at the same time. This avoids the conflict of each one trying to find the other and so on. Reboot one, wait a while, then reboot the other.
Hopefully your problem won't come back!
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