All backups to CIFS share on ReadyNAS 2100 fail with the following error message: Error Message: (4045245)

All backups to a CIFS share hosted on a ReadyNAS 2100 kick off and run as expected for a certain length of time before failing with the following error message: "Error Message: 2129 - can't write cifs:xxx;username@xxx.xxx.xxx.xxx/vRanger$/Production/asff1_421be088-4307-7ebe-fffd-51de456e5079/ksqlp1_20135422_230019_a835fdd6-81de-4beb-9725-763081af93f8/.a05fb76f-9743-45d7-85de-e228b7092fe1/.a05fb76f-9743-45d7-65de-e22ht7092fe1.var." This happens consistently after a certain period of time, 30 minutes for example.