I had two Connect IQ data fields running, and one of them (my own, Flexirunner) had been replaced with the native Timer field, suggesting it was this data field that caused the crash. I was running a release build, not debug, so there is no CIQ_LOG.TXT, but there is information in the device ERR_LOG.TXT. Since the Connect IQ page encourages developers to post such information here, suggesting a bug in Connect IQ or the watch firmware, rather than the app, per se, here it is:
2431 (Forerunner 235) SW ver: 710Build Type: RELEASE
Commit:1bcef5c212eb9f98292ccd1d9b7ff1dbf9457258
ESN: 3922968744
02/02/17 14:16:52
RTL
errnum: 0x002
r0: 0x20007f20
r1: 0x000000b6
r2: 0x000f8551
Stack frame PC, SP: 0x0011953d, 0x20007c30
Call Stack - SP at 0x20007c30:
0x000e0693
0x000f8551
0x000f05df
0x000f8551
0x000f8551
0x0000c001
0x000f11d7
0x001068e5
0x000f11d7
0x000f088d
0x001068e5
0x0010f97b
0x0000c001
0x000f11d7
0x000f088d
0x00112173
0x00106647
0x00111f55
0x001128e9
0x0010050d
0x0010057b
0x00106433
0x000f544d
0x0002c90d
0x00041b31
0x00041e11
0x000427e1
0x000eec31
0x00000000
0x00000000
0x00000000
0x00000000
Uptime: 5856084
2431 (Forerunner 235) SW ver: 710
Build Type: RELEASE
Commit:1bcef5c212eb9f98292ccd1d9b7ff1dbf9457258
ESN: 3922968744
02/02/17 14:17:07
AP
PWR RST CTRL: 0x00400028
POR
2431 (Forerunner 235) SW ver: 710
Build Type: RELEASE
Commit:1bcef5c212eb9f98292ccd1d9b7ff1dbf9457258
ESN: 3922968744
02/02/17 14:17:55
AP
PWR RST CTRL: 0x00400028
POR
2431 (Forerunner 235) SW ver: 710
Build Type: RELEASE
Commit:1bcef5c212eb9f98292ccd1d9b7ff1dbf9457258
ESN: 3922968744
02/02/17 14:18:28
AP
PWR RST CTRL: 0x00400028
POR
2431 (Forerunner 235) SW ver: 710
Build Type: RELEASE
Commit:1bcef5c212eb9f98292ccd1d9b7ff1dbf9457258
ESN: 3922968744
02/02/17 14:18:28
AP
PWR RST CTRL: 0x00400028
POR
2431 (Forerunner 235) SW ver: 710
Build Type: RELEASE
Commit:1bcef5c212eb9f98292ccd1d9b7ff1dbf9457258
ESN: 3922968744
02/02/17 14:19:34
AP
PWR RST CTRL: 0x00400028
POR
Can anyone from Garmin offer any insight as to what that log is telling me?
I'm at a loss how to replicate the situation, it seemed to be random (I've run many hours with this data field).