It's the first drive mapping..
Do you have a policy to wait for the network to be ready? You should, particularly if you use GPO logon scripts instead of user Login scripts.
Are you using any type of SNAC in your environment that would allow connection to the DC to run the login script but block access to other network targets until the local system was validated? This might require a loop that checks the local netmask to be sure it is not 255.255.255.255 before trying to map resources.
Sounds like a timing thing, since it's only the first drive and only at random times. The above can both affect login timing.
Glenn
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Actually I
am a Rocket Scientist!
