For any serious troubleshooting, always have your machine's original FANUC manuals and the machine tool builder's specific documentation at hand.
Check the current value of parameter 1829. Compare it with the machine builder's recommendations. If the value is set too low, the system may generate nuisance alarms even under normal conditions. If you suspect the parameter was accidentally changed, cross-reference it with the machine's original parameter backup. fanuc parameter 1829