New SW modules seize up and stop responding when sending SMS

It’s a M100 3G terminal using a SL8082TR module. I’ve been having this problem since like 2 years ago with different terminals and have been hoping that the problem will go away with newer Firmware but it didn’t happen. Here’s what I got from Hypterminal.

Note: The firmware was originally r7.52.2.a5.201411281219.sl8082tr 1804452 112814 12:19.

at+cgmm
SL8082TR Product

OK
ati3
R7.54.0.A1.201603171313.SL8082TR 1997208 031716 13:13

OK

ati0
Sierra Wireless

SL8082TR Product

OK
ati9
"DWL"," C04.05.14.00.SL8RDBT R2684 CNSHZ-ED-XP0031 2015/11/05 21:36:55","","Sier
ra Wireless",0,"","00000000","00000000"
"FW","FW_754_0_A1_22_1.SL808FAx","R7.54.0.A1.201603171313.SL8082TR","Sierra Wire
less",1997208,"031716 13:13","a887779d","10002020"
"MODEM 3G+","Revision: C04.05.14.00.SL8RDAP R2684 CNSHZ-ED-XP0031 2015/11/05 21:
36:55"
"ROM","8400000"
"RAM","4000000"
"OATRAM","40000"
"DWLNAME","SL808xA"

OK