ESP32 WiFi disconnect after 30 to 40 minutes.

[david@mandy]

Hi,
I am using ESP32 module, I am working on azure mqtt sample code, In that ESP32 is disconnecting with the router after 30 to 40 minutes of Data transactions. I am using the stable ESP-IDF v3.0 latest released SDK. I am not able to figure out why this is happening, please give me some suggestions. The error is

Hard error from SSL_connect: 5
I (8164132) wifi: bcn_timout,ap_probe_send_start
I (8166642) wifi: ap_probe_send over, resett wifi status to disassoc
I (8166642) wifi: state: run -> init (1)
I (8166642) wifi: pm stop, total sleep time: 0/-478219157
I (8166642) wifi: n:5 0, o:5 0, ap:255 255, sta:5 0, prof:1

Thanks and regards.