Sometime, disconnect between Esp32 and gateway and server ChirpStack

Hi every one,
please help me to solve this problem. I already ask in “” not get the answer.

I have problem about ESP32+Lora SX1276 connect with gateway and connect with server ChirpStack by writing firmware send uplink every 1 min. After that, ESP32 +Lora SX1276 not sending uplink then i add watchdog firmware for reset. The result sending uplink again.

I need to know why ESP32+Lora SX1276 stop sending uplink??
This action, i cannot prove, please help me to solve.

Chipstack is a different product. Closing this as this is not relevant for the TTN forum.