Mapped drives on XP

I cannot get a map to survive reboot, I have tried /persistent:yes switch, I have mapped the drives in GPO domain policy preferences and it will not take. The drive letter is F: and it was used on the same app with a previous 2003 server and was asked to be used in the replacement 2008 server,
what could be the issue? Only 2 machines of 10 display the symptom.
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This issue can be mitigated by turning off Fast Logon Optimization (do this on the Default Domain Policy):

Computer Configuration\Administrative Templates\System\Logon\ Always wait for the network at computer startup and logon = Enabled.

It may take a reboot or two to settle in.

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IT2DrAuthor Commented:
Why would it only be a problem on 2 of 10 machines?
Some machines negotiate the network stack faster than others - maybe because of the switch, maybe the OS.

It's not a negative change that I am proposing, it will actually help mitigate many of these weird issues.
IT2DrAuthor Commented:
Thanks, I will try that this evening.
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Windows XP

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