Random Http Issue

[ipadmin]

I have a 2900-24G as our core switch which i am using to manage the VLANS, in the last couple of weeks i have had a really random issue where by all computers in anything but the primary/default VLAN stop being able to browse the net.

When this happens all other protocals work fine FTP, SMTP, POP3 etc i can interigate it from any vLAN using HTTP and DNS resolution works fine as we don't loose access to any servers but the only way to get it back on line is to do a restart which is a complete pain as i have to kick everyone off all servers to do it.

Its speradic and really had to trace, just wondering if anyone had any ideas?

[ipadmin]

Any ideas form anyone?

It seams to happen around the same time of the day, unfortunately when every starts work between 8-9 but has only happened 6 times in the last month and not to any kind of pattern.