MQTT Connection keeps getting disconnected/closed while publishing or subscribing to topics using LTE Modem

• I'm using Quectel modem BG95 with a host MCU to connect to AWS IoT core and publish to topics and subscribe to topics as well.
• I used to get an error occasionally that closed the MQTT connection exactly while doing pub/sub operations and connection had to be re-established , but that was very rare.
• However, since the last few days I have been running tests on multiple devices (using same IoT core endpoint) and have been getting this MQTT dis-connection on each pub or sub operation. I am attaching a log for review.
• To me it seems a server side issue since I have tried it with multiple modems and previous versions of firmware.

[While publishing to topic]

;2022-05-08T02:29:41Z;28;-966233403;462863960;;RAK000121|-45,RAKTEST|-56

AT+QIDEACT=1
OK[ 2022-05-08T02:29:41Z ] [FARM_IP][INFO] MDM_SET_DEACTIVATE_PDP-else


AT+QIACT=1
OK
AT+QMTOPEN=0,"a5u9klmd2viw3z-ats.iot.us-west-1.amazonaws.com",8883
OK

+QMTOPEN: 0,0		           --- [Opening MQTT Connection]
[ 2022-05-08T02:29:41Z ] [FARM_IP][INFO] Mqtt opened
AT+QMTCONN=0,"0123qwer786"
OK

+QMTCONN: 0,0,0                            --- [MQTT client connected]
AT+QMTPUB=0,1,1,0,"fm/1011",72        --- [Publishing to the MQTT Topic]

> ;2022-05-08T02:29:41Z;28;-966233403;462863960;;RAK000121|-45,RAKTEST|-56
OK

+QMTSTAT: 0,1    			 --- [MQTT Connection Closed]

[While Subscribing to topic]

AT+QMTSUB=0,1,"imei/get_logs",0			--- [Subscribing to the MQTT Topic]
OK

+QMTSTAT: 0,1					--- [MQTT Connection Closed]
[  ] [FARM_IP][INFO] Starting timer
AT+QMTSUB=0,1,"imei/get_logs",0			--- [Subscribing to the MQTT Topic]
OK
	
+QMTSTAT: 0,1					--- [MQTT Connection Closed]