__NSFireDelayedPerform crashes
Our Application crash about twice in an hour, crash log is something like:

Thread 0 crashed with ARM Thread State:

    r0: 0x0aae1a20    r1: 0x324b9418      r2: 0x31d96ad0      r3: 0x31a150c5
    r4: 0x00000006    r5: 0x3fb2d580      r6: 0x3fb2d570      r7: 0x2fdfed9c
    r8: 0x3f00443c    r9: 0x0c92e506     r10: 0x3fb2d580     r11: 0x01489000
    ip: 0x3eb40430    sp: 0x2fdfed70      lr: 0x0430dcf3      pc: 0x37a63fbc
  cpsr: 0x000f0030

    Thread 0 name:  Dispatch queue: com.apple.main-thread
    
    Thread 0 Crashed:
    
    0   libobjc.A.dylib               	0x37a63fbc objc_msgSend + 16
    1   UIKit                         	0x0430dcec 0x42ec000 + 138476
    2   UIKit                         	0x0431c464 0x42ec000 + 197732
    3   Foundation                    	0x3524d93c __NSFireDelayedPerform + 408
    4   CoreFoundation                	0x37ef1a5c __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8
    5   CoreFoundation                	0x37ef16c2 __CFRunLoopDoTimer + 358
    6   CoreFoundation                	0x37ef0298 __CFRunLoopRun + 1200
    7   CoreFoundation                	0x37e734d6 CFRunLoopRunSpecific + 294
    8   CoreFoundation                	0x37e7339e CFRunLoopRunInMode + 98
    9   GraphicsServices              	0x37c4afc6 GSEventRunModal + 150
    10  UIKit                         	0x319f373c UIApplicationMain + 1084
    11  UCBrowserHD                   	0x00003418 main (main.m:21)
    12  UCBrowserHD                   	0x000033b0 0x1000 + 9136
    
    0x324a6000 - 0x324bbfff  UIAccessibility armv7  <7982050d0d683f09b102929bd1f87420> /System/Library/PrivateFrameworks/UIAccessibility.framework/UIAccessibility

when 0x324b9418  is _accessibilityScrollStatus.
Have anyone any idea about this crash? It blocks our release to AppStore.

__NSFireDelayedPerform crashes
===

Our Application crash about twice in an hour, crash log is something like:

Thread 0 crashed with ARM Thread State:

    r0: 0x0aae1a20    r1: 0x324b9418      r2: 0x31d96ad0      r3: 0x31a150c5
    r4: 0x00000006    r5: 0x3fb2d580      r6: 0x3fb2d570      r7: 0x2fdfed9c
    r8: 0x3f00443c    r9: 0x0c92e506     r10: 0x3fb2d580     r11: 0x01489000
    ip: 0x3eb40430    sp: 0x2fdfed70      lr: 0x0430dcf3      pc: 0x37a63fbc
  cpsr: 0x000f0030

    Thread 0 name:  Dispatch queue: com.apple.main-thread
    
    Thread 0 Crashed:
    
    0   libobjc.A.dylib               	0x37a63fbc objc_msgSend + 16
    1   UIKit                         	0x0430dcec 0x42ec000 + 138476
    2   UIKit                         	0x0431c464 0x42ec000 + 197732
    3   Foundation                    	0x3524d93c __NSFireDelayedPerform + 408
    4   CoreFoundation                	0x37ef1a5c __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8
    5   CoreFoundation                	0x37ef16c2 __CFRunLoopDoTimer + 358
    6   CoreFoundation                	0x37ef0298 __CFRunLoopRun + 1200
    7   CoreFoundation                	0x37e734d6 CFRunLoopRunSpecific + 294
    8   CoreFoundation                	0x37e7339e CFRunLoopRunInMode + 98
    9   GraphicsServices              	0x37c4afc6 GSEventRunModal + 150
    10  UIKit                         	0x319f373c UIApplicationMain + 1084
    11  UCBrowserHD                   	0x00003418 main (main.m:21)
    12  UCBrowserHD                   	0x000033b0 0x1000 + 9136
    
    0x324a6000 - 0x324bbfff  UIAccessibility armv7  <7982050d0d683f09b102929bd1f87420> /System/Library/PrivateFrameworks/UIAccessibility.framework/UIAccessibility

when 0x324b9418  is _accessibilityScrollStatus.
Have anyone any idea about this crash? It blocks our release to AppStore.
