840 (Non Solar) Rebooted/Restarted during session

The same thing happened to me twice on the same ride. There is something wrong

I had this same problem 3 times in the last month, including one yesterday during a mtb ride.

My garmin is a Edge 840 Non Solar. It just rebooted without reason during session.

Ok, device rebooted again yesterday during a mtb ride.

Very frustrating.

Already on latest firmware 19.19

Most of the time I get the spontanous reboot a few minutes after I started an activity, like described above, full boot messages with battery level display, loading maps, etc. and the landing in the "stopped activity" mode with the red frame. Same happens again sometimes after ending and uploading the activty.

Garmin/Debug/err_log.bak (I masked the S/N unit_id):

[
{
"unit_id":"XXXXXXXXXX",
"product_name":"Edge 840",
"software_part_number":"006-B4062-00",
"ms_since_epoch":1702296570000,
"system_version":"19.22",
"build_type":"PRODUCTION",
"backtrace":"
Function Address: 0x60A45F7C
   Call Address at Function: 0x60A45F94

Function Address: 0x60C32C88
   Call Address at Function: 0x60C33126

Function Address: 0x60C33A8E
   Call Address at Function: 0x60C33AB8

Function Address: 0x60A461E6
   Call Address at Function: 0x60A461FE

Function Address: 0x60270D10
   Call Address at Function: 0x60270EF6

Function Address: 0x60273C98
   Call Address at Function: 0x60273E1E

Function Address: 0x60267178
   Call Address at Function: 0x602673B8

Function Address: 0x60C386C8
   Call Address at Function: 0x60C387D4

Function Address: 0x602659B8
   Call Address at Function: 0x60265A0C

Function Address: 0x60C30DE8
   Call Address at Function: 0x60C30DF0

",
"error_cause":"RTL Trap",
"proprietary_info":{
    "Commit ID":"d908b2c51f2933c0edb287e47b5a85961741727b",
    "Time":"2023-12-11 13:9:30",
    "Ram Dump":"N/A",
    "ESht PC":"0x603ECD8D",
    "ESht SP":"0x629B8EF0",
    "RTL Error Number":"6E5D800F",
    "Error Message":"6232DF40,60270EF7,000052D0,000519D9,03655454",
    "Task Name":"DGNSS_main",
    "Saved SP":"6232D408",
    "Saved LR":"60C33127",
    "Saved PC":"60A45F95",
    "R[0]":"0x6232DF40",
    "R[1]":"0x60270EF7",
    "R[2]":"0x000052D0",
    "R[3]":"0x000519D9",
    "R[4]":"0x03655454",
    "R[5]":"0x00000000",
    "R[6]":"0x00000000",
    "R[7]":"0x00000000",
    "R[8]":"0x00000000",
    "R[9]":"0x00000000",
    "R[10]":"0x00000000",
    "R[11]":"0x00000000",
    "R[12]":"0x00000000",
    "R[13]":"0x00000000",
    "R[14]":"0x00000000",
    "R[15]":"0x00000000",
    "cpsr":"00000000"
    }
,
"Project Specific":{
    "data" : {

    }
}
}]

My 840 spontanously reboots every 4-6 minutes while lying on my desk, no activity in progress, no sensors connected. I noted down the times of the latest reboots: 07:43, 07:50, 07:54, 07:58, 08:02, 08:06, 08:10

These reboots do not happen if the 840 is in mass-storage mode while connected via USB-C to my computer.

awarda@fedora:/media/awarda/GARMIN/Garmin/Debug$ cat err_log.bak 
[
{
"unit_id":"XXXXXXXXXX",
"product_name":"Edge 840",
"software_part_number":"006-B4062-00",
"ms_since_epoch":1702451394000,
"system_version":"19.22",
"build_type":"PRODUCTION",
"backtrace":"
Function Address: 0x60A45F7C
   Call Address at Function: 0x60A45F94

Function Address: 0x60C32C88
   Call Address at Function: 0x60C33126

Function Address: 0x60C338C6
   Call Address at Function: 0x60C338F0

Function Address: 0x6061A9F4
   Call Address at Function: 0x6061AA9C

Function Address: 0x6061192C
   Call Address at Function: 0x60611D42

Function Address: 0x60613078
   Call Address at Function: 0x606130C4

Function Address: 0x60613114
   Call Address at Function: 0x6061313A

Function Address: 0x60985EC8
   Call Address at Function: 0x60985F9C

Function Address: 0x60985FD2
   Call Address at Function: 0x60986024

Function Address: 0x60987A62
   Call Address at Function: 0x60987AB8

Function Address: 0x60988B42
   Call Address at Function: 0x60988CA2

Function Address: 0x60984B8C
   Call Address at Function: 0x60984EEC

Function Address: 0x60C30DE8
   Call Address at Function: 0x60C30DF0

",
"error_cause":"RTL Trap",
"proprietary_info":{
    "Commit ID":"d908b2c51f2933c0edb287e47b5a85961741727b",
    "Time":"2023-12-13 8:9:54",
    "Ram Dump":"N/A",
    "ESht PC":"0x603ECD8D",
    "ESht SP":"0x629B8EF0",
    "RTL Error Number":"6E5D800F",
    "Error Message":"6299FF98,6061AA9D,00000FFC,00052325,03666684",
    "Task Name":"PSN main",
    "Saved SP":"6299FBA8",
    "Saved LR":"60C33127",
    "Saved PC":"60A45F95",
    "R[0]":"0x6299FF98",
    "R[1]":"0x6061AA9D",
    "R[2]":"0x00000FFC",
    "R[3]":"0x00052325",
    "R[4]":"0x03666684",
    "R[5]":"0x00000000",
    "R[6]":"0x00000000",
    "R[7]":"0x00000000",
    "R[8]":"0x00000000",
    "R[9]":"0x00000000",
    "R[10]":"0x00000000",
    "R[11]":"0x00000000",
    "R[12]":"0x00000000",
    "R[13]":"0x00000000",
    "R[14]":"0x00000000",
    "R[15]":"0x00000000",
    "cpsr":"00000000"
    }
,
"Project Specific":{
    "data" : {

    }
}
}]