About DWM100 ranging problem

I have about DWM100 ranging problem
I use the official program (tag:ex_05a_ds_twr_init & anchor:ex_05b_ds_twr_resp)
First, the tag transmitted to the anchor is no problem.
However, the anchor transmitted to the tag, the tag cannot be received.
I do not know how it happened… ><

Hi Tsung, please check the system_status regiester [ID 0x0F] when problem happened, it will tell you the cause of the rx/tx issue.