Why does the Tuya Zigbee solution automatically quit the distribution network if it has not found the network for a period of time?

Tuya Zigbee scheme is divided into strong current scheme and weak current scheme. For example, the zero-fire line scheme in the development free scheme of lighting and electrician belongs to strong current scheme, and the default is to quit the distribution network in 3 minutes, while the single fire scheme belongs to weak current scheme and quit the distribution network in 30 seconds.