Here's the content of the ERR_LOG.txt that I got from one of the users:
2413 (fenix 3 HR) SW ver: 430
Build Type: RELEASE
ESN: 3927694235
Battery Voltage: 3.821000V
11/02/17 00:00:00
RTL
errnum: 0x000
r0: 0x00000000
r1: 0x20002f58
r2: 0x20002df8
r3: 0x00030c98
Return Address (LR): 0x0014242b:Call Stack - PSP at 0x20002e20:
0x00030c99
0x001420a7
0x00142195
0x000404d5
0x0003ff23
0x000404d5
0x00040685
0x00040f69
0x0004110d
0x00041117
0x000419c9
0x000419ff
0x0006ff4d
0x00102e25
0x00005d97
0x00040005
0x00100003
0x00120003
0x00008e49
0x00077f49
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0011ee01
Uptime: 5153115
2413 (fenix 3 HR) SW ver: 450
Build Type: RELEASE
ESN: 3927694235
Battery Voltage: 3.886000V
11/04/17 21:33:51
RTL
errnum: 0x002
r0: 0x20023038
r1: 0x00032024
r2: 0x0011bffb
r3: 0x00000000
Return Address (LR): 0x0008a42b:Call Stack - PSP at 0x20022e40:
0x0008a42b
0x0011bffb
0x0005e75f
0x0011bffb
0x0005e94f
0x00044097
0x0011bffb
0x00008405
0x0012f8cb
0x000d4685
0x0008a16d
0x0008a16d
0x00008405
0x0008a9d9
0x0008a9d9
0x001622ef
0x00162cbb
0x0005e1bd
0x001f97ef
0x00162bd5
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0000af25
page addr = 0x0012e89d
page addr = 0x000b9a01
Uptime: 283502
2413 (fenix 3 HR) SW ver: 450
Build Type: RELEASE
ESN: 3927694235
Battery Voltage: 3.877000V
11/04/17 21:37:49
BF
PC: 0x0005e934
LR: 0x0011bffb
SP: 0x20022e90
CFSR: 0x00008200
Return Address (LR): 0x0016486b:Call Stack - PSP at 0x20022e70:
0x0011bffb
0x0011bffb
0x0011bffb
0x0011bffb
0x00007605
0x0012f8cb
0x000d4685
0x0008a16d
0x0008a16d
0x00007605
0x0008a9d9
0x0008a9d9
0x001622ef
0x00162b81
0x0005e1bd
0x001f97ef
0x00115cc9
0x0008a9d9
0x00115cc9
0x0008a9d9
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0000af25
page addr = 0x0012e89d
page addr = 0x000b9a01
Uptime: 230190
2413 (fenix 3 HR) SW ver: 450
Build Type: RELEASE
ESN: 3927694235
Battery Voltage: 3.876000V
11/04/17 21:39:51
RTL
errnum: 0x002
r0: 0x20023038
r1: 0x000340fc
r2: 0x0011bffb
r3: 0x00000000
Return Address (LR): 0x0008a42b:Call Stack - PSP at 0x20022e40:
0x0008a42b
0x0011bffb
0x0005e75f
0x0011bffb
0x0005e94f
0x0001a66f
0x0011bffb
0x0000ab05
0x0012f8cb
0x000d4685
0x0008a16d
0x0008a16d
0x0000ab05
0x0008a9d9
0x0008a9d9
0x001622ef
0x00162b81
0x0005e1bd
0x001f97ef
0x0000c961
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0000af25
page addr = 0x0012e89d
page addr = 0x000b9a01
Uptime: 114507
2413 (fenix 3 HR) SW ver: 450
Build Type: RELEASE
ESN: 3927694235
Battery Voltage: 3.927000V
11/05/17 07:53:12
BF
PC: 0x0005e934
LR: 0x0011bffb
SP: 0x20022e90
CFSR: 0x00008200
Return Address (LR): 0x0016486b:Call Stack - PSP at 0x20022e70:
0x0011bffb
0x0011bffb
0x0011bffb
0x0011bffb
0x0000af05
0x0012f8cb
0x000d4685
0x0008a16d
0x0008a16d
0x0000af05
0x0008a9d9
0x0008a9d9
0x001622ef
0x00162cbb
0x0005e1bd
0x001f97ef
0x0000c961
0x00092b1d
0x00162bd5
0x0000c961
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0000af25
page addr = 0x0012e89d
page addr = 0x000b9a01
Uptime: 36794073
2413 (fenix 3 HR) SW ver: 450
Build Type: RELEASE
ESN: 3927694235
Battery Voltage: 4.088000V
11/05/17 08:55:53
BF
PC: 0x0005e934
LR: 0x0011bffb
SP: 0x20022e90
CFSR: 0x00008200
Return Address (LR): 0x0016486b:Call Stack - PSP at 0x20022e70:
0x0011bffb
0x0011bffb
0x0011bffb
0x0011bffb
0x00008f05
0x0012f8cb
0x000d4685
0x0008a16d
0x0008a16d
0x00008f05
0x0008a9d9
0x0008a9d9
0x001622ef
0x00162b81
0x0005e1bd
0x001f97ef
0x00162bd5
0x0000c961
0x00092b1d
0x00115cc9
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0000af25
page addr = 0x0012e89d
page addr = 0x000b9a01
Uptime: 3753801
===============================================================
PS: sorry if this is not the right forum to report devices crashes. Please let me know where I should post it otherwise