iOS System crash after updating to iOS5

Could anybody have an experience of system crash after upgrading iOS version to 5.0 or later?
My device is iPod touch 4G, and my co-workers have iphone 3gs and 4.
Above problem has been occurred very often just on my device.
Also, when the crash is occurred, there's no log printed.

I'm not sure but I guess that the problem is from memory allocations.
Could anybody help me?

jnoxx said:

Errr, at least show us what goes wrong?
if it's just a crash.. try using breakpoints to see where it goes wrong, turn on NSZombieEnabled, to maybe get better definitions
This is quite useless

Click to expand...

Thank you for your reply.
I'll try use NSZombieEnabled.
Also, I already used breadkpoints to debug, but it was not helpful.
Because it was a sudden crash!
Even though program runs at the debug mode, the system is dead without informing any breakpoints in the xcode.
On the console window, I can see printed messages that there are some other background programs getting dead(such as mailing service, etc...) when my program is dead.