Dwm_systime_us_get() returns 0


We are developing some features on C user app of DWM1001 module, and we need a reference time. We saw in the documentation the use of dwm_systime_us_get() function, and works fine until we restart the tag, from this moment, it always returns the value 0 even when restarting the tag again.

EDITED: Only when responsive mode is disabled, when responsive mode is enabled works fine.

Is there another function like ut (uptime) for use inside API - C user app?

Thank you in advance