How to debug crashes?

Today my fenix 3 crashed, when I switched from an activity to my own watchface. This ist the ERR_LOG.TXT:

2050 (fenix 3) SW ver: 510
Build Type: RELEASE
ESN: 3911177798
Battery Voltage: 3.787000V
12/19/15 15:20:51
RTL
errnum: 0x00f
r0: 0x2002e1f0
r1: 0x00024b3d
r2: 0x00000818
r3: 0x00000073
Return Address (LR): 0x001337b3:Call Stack - PSP at 0x2002e028:
0x001337b3
0x0006a31f
0x00024b3d
0x00024b3d
0x0000255d
0x00024b3d
0x0006a3ab
0x00024b3d
0x001164f9
0x00024b3d
0x00038a2b
0x00069087
0x0005a8d1
0x0005e9f9
0x0005e9f9
0x0001d695
0x0005e9f9
0x00025397
0x0005aa3b
0x0005a8d1
HWM_usb_connected = 0x00. HWM_usb_mode = 0x01.
page addr = 0x0010e4d9
Uptime: 512653712

Do I have a chance to determine, what the problem is?

Thank you
Marco