Connecting over HTTP only work initially after enabling modem

Question

Hello, I am having an issue where I can only connect over HTTP in the first minute or so after running AT+CFUN=1. After this the requests time's out with ERROR. Toggling the modem via AT+CFUN=0 AT+CFUN=1 will again create a short time window when the HTTP connection is successful. 
 
 I am currently using the nRF9160 DK with modem firmware 1.3.5 and the Serial LTE Modem application. 
 Attached is the set of AT commands which reproduce the issue and modem trace while reproducing the issue. 
 Any ideas as to what might be causing this? 
 -Cheers 
 trace-2023-07-13T04-52-31.799Z.mtrace.zip 
 
 Ready
> AT+CFUN=1

OK
> AT+CFUN=1

OK
> AT%XCONNSTAT=1

OK
> AT%XCONNSTAT?

%XCONNSTAT: 0,0,0,0,0,0

OK
> AT+CMEE=1

OK
> AT%XSIM=1

OK
> AT+CEREG=5

OK
> AT%MDMEV=1

OK
> AT%CESQ=1

OK
> AT+CGSN=1

+CGSN: "351358815345076"

OK
> AT+CGMM

nRF9160-SICA

OK
> AT+CEMODE?

+CEMODE: 2

OK

%CESQ: 34,1,13,1
> AT+CMEE?

+CMEE: 1

OK
> AT+CNEC?

+CNEC: 0

OK
> AT+CGEREP?

+CGEREP: 0,0

OK
> AT+CIND=1,1,1

OK
> AT+COPS=3,2

OK
> AT+CGDCONT?

+CGDCONT: 0,"IP","simbase","10.218.135.156",0,0

OK
> AT+CGACT?

+CGACT: 0,1

OK
> AT+CESQ

+CESQ: 99,99,255,255,15,35

OK
> AT%XSIM?

%XSIM: 1

OK
> AT+CPIN?

+CPIN: READY

OK
> AT+CIMI

234104099298714

OK
> AT+CNEC=24

OK
> AT+CEER

+CEER: "ESM 50"

OK
> AT+CGEREP=1

OK
> AT%XPOFWARN=1,30

OK
> AT%XVBATLVL=1

OK
> AT+CGMI

Nordic Semiconductor ASA

OK
> AT+CGMR

mfw_nrf9160_1.3.5

OK
> AT+CGSN

351358815345076

OK
> AT%XMODEMUUID

%XMODEMUUID: dc8e7aff-5331-409e-be02-5529dffa5537

OK
> AT%XDATAPRFL?

%XDATAPRFL: 2

OK
> AT+CEREG?

+CEREG: 5,5,"3026","08308F0B",7,,,"11100000","11100000"

OK
> AT+CFUN?

+CFUN: 1

OK

%CESQ: 36,1,18,2
> AT%CESQ=1

OK
> AT+CSCON=1

OK
> AT+CSCON?

+CSCON: 1,1

OK
> AT+CPAS

+CPAS: 0

OK
> AT+CEDRXRDP

+CEDRXRDP: 4,"1011","",""

OK
> AT%XTIME=1

OK
> AT%CONEVAL

%CONEVAL: 0,0,7,35,19,29,"08308F0B","50501",161,9410,28,0,0,8,1,1,118

OK

+CSCON: 0
> AT%XCBAND=?

%XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)

OK
> AT%XCBAND

%XCBAND: 28

OK
> AT%HWVERSION

%HWVERSION: nRF9160 SICA B1A

OK
> AT%XMODEMTRACE=1,2

OK
> AT%XSYSTEMMODE?

%XSYSTEMMODE: 1,1,0,1

OK
> AT%XICCID

%XICCID: 89103000000031673631

OK
> AT%XEMPR?

%XEMPR: 

OK
> AT+CGDCONT?

+CGDCONT: 0,"IP","simbase","10.218.135.156",0,0

OK
> AT+COPS?

+COPS: 0,2,"50501",7

OK

%CESQ: 31,1,14,2
> AT%XMONITOR

%XMONITOR: 5,"","","50501","3026",7,28,"08308F0B",161,9410,31,28,"","11100000","11100000","01001011"

OK
> AT+CPINR="SIM PIN"

+CPINR: "SIM PIN",3

OK
> AT+CPINR="SIM PIN2"

+CPINR: "SIM PIN2",3

OK
> AT+CPINR="SIM PUK"

+CPINR: "SIM PUK",10

OK
> AT+CPINR="SIM PUK2"

+CPINR: "SIM PUK2",10

OK
> AT%XSIM?

%XSIM: 1

OK

%CESQ: 31,1,9,1

%CESQ: 31,1,14,2

%CESQ: 31,1,9,1
> AT#XHTTPCCON=1,"www.bosl.com.au",80

#XHTTPCCON: 1

OK

+CSCON: 1

%CESQ: 34,1,14,2

%CESQ: 36,1,19,2
> AT#XHTTPCCON=0,"www.bosl.com.au",80

#XHTTPCCON: 0

OK

%CESQ: 37,1,13,1

%CESQ: 37,1,19,2
> AT#XHTTPCCON=1,"www.bosl.com.au",80

#XHTTPCCON: 1

OK
> AT#XHTTPCCON=0,"www.bosl.com.au",80

#XHTTPCCON: 0

OK

+CSCON: 0

%CESQ: 32,1,8,1

%CESQ: 32,1,14,2

%CESQ: 32,1,9,1

%CESQ: 33,1,14,2

%CESQ: 31,1,9,1

%CESQ: 31,1,14,2
> AT#XHTTPCCON=1,"www.bosl.com.au",80

#XHTTPCCON: 0

ERROR

+CSCON: 1

%CESQ: 36,1,18,2

%CESQ: 37,1,13,1

%CESQ: 37,1,18,2

%CESQ: 38,1,13,1

%CESQ: 37,1,18,2

+CSCON: 0

%CESQ: 30,1,8,1

%CESQ: 30,1,13,1
> AT+CFUN=0

OK

+CGEV: ME PDN DEACT 0

+CSCON: 1

+CEREG: 0

+CIND: "service",0

+CIND: "roam",0

+CGEV: ME DETACH

%CESQ: 35,1,16,2

%CESQ: 255,0,255,0

+CSCON: 0

%XSIM: 0
> AT+CFUN=1

OK
> AT#XHTTPCCON=1,"www.bosl.com.au",80

#XHTTPCCON: 1

OK
> AT#XHTTPCCON=0

#XHTTPCCON: 0

OK