LC86GLA does not output NMEA frames

IoT Modules GNSS Module
1

I’m starting to work with LC86GLA and I’m now testing 3 units.

After a few days, one of the units stopped sending NMEA frames (RMC, GGA, etc.), it only outputs the following information during its initialization (when turned on):

[Bootloader] bl_uart_init done
set CP10 and CP11 Full Access
[CLK] Dynamic Clock Management: Enable
[CLK] frequency meter
CM4(CMSYS) freq [215974]KHz
BUS(FSYS) freq [107974]KHz
SFC freq [107974]KHz
SPISLV freq [0]KHz
I3C freq [108000]KHz
RTC SRAM freq [107974]KHz
hal_flash_init
BL Jump to addr 0x8009000 (0)
$PQTMVER,1,MODULE,LC86GLANR12A02S,2023/12/26,09:53:00*11

I had tried to send $PAIR007 to reset the module to its factory default settings but still same behaviour and no NMEA frames.

I would really appreciate any comments on what the problem and root cause of this unit’s failure could be, as I am now evaluating Quectel GNSS LC86GLA to be used in series production for a project.
Tks!

2

btw, as additional informantion, when I sent $PAIR0073D to the module I got the following response: $PAIR001,007,23E

but according to its manual, the correct response should be: $PAIR001,007,0*3C

Not sure if this is the case, but this response number “2” I got means error code “Failed execution” for PQTM Messages.