SW 5500 Ports blocked

[Cahier]

Hello, first excuse my english (am i french ...), i have a problem on a Switch 5500 (48 ports), last week 5 ports stop to communicate, i'm try whitout DHCP and the same. when i'm look the display diagnostics i see some error like "Packets dropped By GBP full or insufficient bandwidth: 12706" on the port blocked. i don't understand what happen and how resolve this. I can't reboot my switchs stack (7 elements) because it's the network heart. thank's for your help.

[scotteberg]

Have you tried a shutdown and a undo shutdownon each interface