Hunting a non-reproduceable crash

Question

I've got a Utility app which uses AudioQueue services for recording and playing samples. It runs fine on the Simulator and on both my test devices for hours and hundreds of launches. But I have a couple of users who are reporting that it crashes on their device (quits back to the home screen 2 seconds after launch).
I've tried the usual stuff in my test environments: checking all status return values, running Instruments to check for memory usage and leaks, surrounding pointer accesses with NULL pointer checks, adding array bounds checks. But I haven't found any good candidates for the problem cause yet.
Any other ideas on what to look for to hunt down this kind of problem?
Anything I should try asking a random and remote iPhone user to report about their particular device?
Thanks.

Answer 1

Hi. I know it's quite some time after the original post, but did you (or anyone else) ever get any resolution on this? We have a couple of users reporting that our game crashes on startup, but it's not something we've ever seen first hand. So far though, the numbers are low, over 4 figure sales and less than a handful of crash problems, all but 1 (so far as we know) of which wasn't fixed by rebooting the iPhone.
Our games have a fairly large set sound samples for audio, and use the AudioQueue services too.
Any advice would be appreciated.
Cheers,
Steve