8.09. The uninterrupted service is interrupted when the employee:(1) voluntarily quits his employment;
(2) is dismissed for a valid reason;
(3) is laid off due to a lack of work for a period exceeding 6 months;
(4) is laid off due to a lack of work, and fails to report in to work within 48 hours following receipt of his recall by a registered or certified letter from his employer at his last known address.