ZR could not link the ZC after ZC doing “restart”

Hi all

       there is a issue of  the  HA1.2.2a  about  ZR and ZED could not re-link the ZC ，when ZC doing the  “restart”

       as the ZED test ，please refer the post ：https://e2e.ti.com/support/wireless_connectivity/zigbee_6lowpan_802-15-4_mac/f/158/t/506481

       as the  ZR doing the same  test   with above post note

       1.  joining  the ZC

       2.  sending someting (IEEE Request)  to ZC and ask it for defualt RSP,  it is OK 

       3.  restart  the ZC

       4.  ZR could not  get anything from the ZC anymore(include  ACK)

       5, Both ZC and ZR all enable NV_Restore

"ZC restart " means execute belowing code ，（maybe  you can only disable the ZC NV_RESTORE， and do the power restart）

this issue could be happen。

uint8 pBuf = ZCD_STARTOPT_CLEAR_STATE | ZCD_STARTOPT_CLEAR_CONFIG; 

(void)znp_nv_write(ZCD_NV_STARTUP_OPTION, 0, 1, &pBuf); 

zapPhyReset(zapAppPort); 

return;

Q1

why does  ZC could not RSP the ZR ?

Q2

is that mean  the ZR is not connect the ZC anymore ?

Q3

how could we keep the ZR connect ZC ,no matter ZC doing above "restart"  

BR