Windows phone 8 app crashes after playing 2-3 tyms

Continuing the discussion from Windows phone 8:

game gets crashed after playing for 2-3 tyms.
Wp8-xaml

First-chance exception at 0x778B1247 in simpleGame.exe: Microsoft C++ exception: comerror at memory location 0x0120C130.

and some times a access violation error

I am using only .wav files. My app resources size is 41.3 mb

I debugged why it is crashing i found memory is increasing at 141 mb its getting crashed by this variable i founded the memory issue

long currentMemoryInBytes = Windows::phone::System::Memory::MemoryManager::ProcessCommittedBytes;

this stuff is not working
if(currentMemoryInBytes > 90107904)
{
CCTextureCache::sharedTextureCache()->removeUnusedTextures();
}

Need Help ASAP