ios - How to debug whole iPad freezing? -

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i have ipad drawing app uses core data , quartz 2d. users , have been experiencing freeze problems happen 1 or 2 times every hour if unlucky. have tried can debug problem, making sure there no dead locks, no ui code being called background threads , no core data methods called in different threads. (i used method swizzling check them.)

but problem still here, , there no crash log because whole ipad freeze , user has hard restart. happens when drawing have no clue why happens. seems related fact updates cashapelayers every time uitouch moved. (it not feasible use bitmaps instead because of memory usage) used instruments manually check every function called when drawing.

what else can try fix problem? has been bothering me few months now... , begin wonder if bug ios.


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