RAK4630 bug and reboot each 4 secondes

Hi,

My RAK4630 (on RAK 19007 with rtc/sensor BME/EEPROM) reboot few seconds after it started.
6 units are concerned (on 45).
It is impossible to upload new firmware because it doesn’t stay connect to pc with USB connexion.
Others units work.

It is a material problem?

Thank in advance for your help.

Bruno

Some output from arduino IDE
“”"""""""""""""

INFO | ??:??:?? 1 Initializing NodeDB
INFO | ??:??:?? 1 Loading /prefs/db.proto
ERROR | ??:??:?? 1 assert failed C:\Users\lescalier.platformio\packages\framework-arduinoadafruitnrf52\libraries\Adafruit_LittleFS\src\littlefs\lfs.c: 1144, lfs_ctz_find, te

======================================
DEBUG | 00:04:18 4 [BME680_Task] Updating BSEC STATE
DEBUG | 00:04:18 4 [BME680_Task] Saving BSEC
ERROR | 00:04:18 4 [BME680_Task] assert failed C:\Users\lescalier.platformio\packages\framework-arduinoadafruitnrf52\libraries\Adafruit_LittleFS\src\littlefs\lfs.c: 123��@INFO | ??:??:?? 3

=======================================

//\ E S H T /\ S T / C

DEBUG | ??:??:?? 4 Filesystem files:
DEBUG | ??:??:?? 4 RAK (88 Bytes)
DEBUG | ??:??:?? 4 MODE (1 Bytes)
DEBUG | ??:??:?? 4 (8 Bytes)
DEBUG | ??:??:?��@INFO | ??:??:?? 0

If you are using Arduino BSP, then you can just double push the reset button to get the device into bootloader/UF2 mode.

From the error messages, it looks like you are trying to use LittleFS, maybe you forgot to initialize it?