Very strange iPhone app crash problem with tabbar based app

I know the title sounds a bit awkward but let me explain my problem.

I have a tab bar based iPhone app which works perfectly so far. I can switch through the tabs and every tab loads a view controller.

But here is how it crashes. After I used the app and working with a bunch of other apps I switch back to my app (for example after one hour). The app shows the screen where I left it. Now when I try to change the tab, it crashes immediately.

The problem is that I can't reproduce this crash in the simulator or in the debug mode. I tried to open it, then close it, then reopen it but then everything works. Only after a certain amount of time the crash can be reproduced. But I don't have any logs.

Maybe anyone had the same th开发者_JS百科e problem and knows what to do here?

Could it be related to low memory (i.e., you have a bug that only shows up during low memory)? Have you tried "Simulate Memory Warning" in the simulator?

Connect your device with system using iPhone utility and found the reason for crash. It may be memory problem only.