Hi Carlos,
Did this problem start suddenly? Can you share the error messages you are seeing?
You may have a corrupted installation. It is possible to reload EXOS from the BootROM to try to recover. You will lose any configuration files saved on the switch by doing this.
You may also have a hardware failure that requires an RMA.
I would invite you to open a case with GTAC so they can help determine if the errors are recoverable or if it will require a replacement.