Mapped drive and/or share becomes unavailable

Hi there, we have a client using a NAS box to provide a shared resouce on their LAN which is mapped to a network drive. Mapped drive is connected at logon through netlogon script. Just about on a daily basis this mapped drive/share becomes unavailable i.e. if you browse to mapped drive it has a red X on it and you cannot open it. If you type in the UNC path or IP address of the NAS device itself you can view it but you cannot open the shared folder. Interesting to note that the 'Public' share (default setup) is accessible. Temporary fix is to logon to the NAS box and reboot it, access is then available for a day or more. NAS box is in workgroup mode for simplicity and has not been joined to domain (no A.D integration).

Troubleshooting to date = new user credentials created/used, update firmware, rebuild Raid array, replaced device with new, but same model unit.
Actual question is, are there commonly any limitations to the number of concurrent network connections that such a device could have? We have approx. 15 of these deployed with other clients with out any issues - however these would be on much smaller LANs. Has anyone come across a similar issue?
Cheers.
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CLLAsked:
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DistinctiveITCommented:
What is the make/model of the NAS box?
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CLLAuthor Commented:
Promise Smartsor NS4300N, c/w Firmware SR2
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DistinctiveITCommented:
What are the permissions set to on the shared folder? Is the everyone group allowed full access?
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CLLAuthor Commented:
Yes full access is available to everyone.
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CLLAuthor Commented:
We have had a successful result by removing the mapping of this share in the net logon batch script. As we initially suspected there appears to be a limitation to the number of concurrent connections that this device can handle. Although this is not the desired configuration it does actually suit the clients needs.
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