Serial LTE modem fault

Hello. I'm using serial lte modem as mqtt client.

After a while I receive fault. Adding logs:

#XMQTTEVT: 9,0
ESP:LTE: PINGRESP packet
#XMQTTEVT: 9,0
PINGRESP packet
CR LF #XMODEM: FAULT,0x4,0x7eefa CR LF CR LF #XMQTTEVT: 1,-113 CR LF
#XMQTTEVT: 1,-113
AT#XMQTTCON=0,"ThingName","","","a1gzieuy3t1932.iot.us-east-1.amazonaws.com",8883,32936
CR LF #XMODEM: SHUTDOWN,0 CR LF
CR LF #XMODEM: INIT,0 CR LF CR LF ERROR CR LF

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