We have been testing Zigbit900 modules for a while and sometime see them losing their settings or code. We don't know exactly what happens but the result is that thay don't transmit data anymore. After re-flashing them via the bootloader, they are working fine again.
The stack used is 1.14.0 with SerialNet
The impression is that the frequent use of the ATZ command to store settings persistantly could cause this.
Anyone seeing similar issues?