CC1310: can't remove the end device's information saved in the coordinator

Hi,

 I have a big problem  in 15.4 stack (simplelink cc1310  1.40 sdk).

I remove the information of end devices saved in the coordinator by call cllc_removedevice() ,and the coordiantor  transmits  informations  to end devices to delete their network information,the end devices call csf_clearAllItem()  to delete the network information. but I find sometimes the coordinator can't  delete the information of the device i want to remove.I think there is a problem in reading informations from NV.

Thanks!