MyApp works well 98% of the time, but sometimes it crashes. It&#39;s so random.

The crash report shows the following.

    Thread : Crashed: com.apple.main-thread
    0  libobjc.A.dylib                0x3b1ae626 objc_msgSend + 5
    1  Foundation                     0x310e2381 _netServiceMonitorCallBack + 104
    2  CFNetwork                      0x302ea3b5 _QueryRecordReply(_DNSServiceRef_t*, unsigned int, unsigned int, int, char const*, unsigned short, unsigned short, unsigned short, void const*, unsigned int, void*) + 324
    3  libsystem_dnssd.dylib          0x3b7289d9 handle_query_response + 168
    4  libsystem_dnssd.dylib          0x3b72773f DNSServiceProcessResult + 582
    5  CFNetwork                      0x302ea3e5 _SocketCallBack_Mon(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 20
    6  CoreFoundation                 0x30691189 __CFSocketPerformV0 + 580
    7  CoreFoundation                 0x3068efaf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
    8  CoreFoundation                 0x3068e477 __CFRunLoopDoSources0 + 206
    9  CoreFoundation                 0x3068cc67 __CFRunLoopRun + 630
    10 CoreFoundation                 0x305f7729 CFRunLoopRunSpecific + 524
    11 CoreFoundation                 0x305f750b CFRunLoopRunInMode + 106
    12 GraphicsServices               0x355336d3 GSEventRunModal + 138
    13 UIKit                          0x32f58871 UIApplicationMain + 1136
    14 MyApp                          0x0013f813 main (main.m:16)

All these look like internal methods. I experience these crashes on iPad 4 running iOS 7.1.2.
How can I nail it down? All help is appreciated.

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ios crash EXC_BAD_ACCESS KERN_INVALID_ADDRESS