I recently had an issue with WD crashing at 23:55. The crash was related to the Data Backup .zip at 23.
I resolved this issue by first turning off the Data Backup. I then changed the time to 7 (07:55) and turned the Data Backup on. I believe setting the Data Backup for any hour except 23 will resolve the crash issue.
BTW This is not an issue when WD is in the stationess mode. (Not busy enough to cause a problem?)