Big memory leak????

Hello, everyone!
My programm use ExternalInterruptEvent for calling some native 
function when ExtInt occur on the pin (my device generate 
ExtInt evry 300ms).
ExternalInterruptEvent start native function with some 
parameters ( one of them is byte_array_pointer). Native 
function read data from PCE0 and write it to 
byte_array_pointer, after that it read the data from 
byte_array_pointer and write it to file_data_pointer (which is 
calculated every time after native function).
After native function my ExternalInterruptEvent send 
byte_array_data to CANBus if necessary.
file_data_pointer is calculated by this way:
NextDataPointer (pointer to the next block of 512 bytes) is 
settled by using 3 first bytes of first data block. 
CurrentDataPointer=NextDataPointer+3;
After every call of native function 
if(we stay in the same data block) 
{
   CurrentDataPointer+=48; (48 - length of data written to 
file)
} 
else 
{
   I write first part of data until the  end of data block;
   I  set NextDataPointer and CurrentDataPointer;
   I write the last part of data to the begining of the next 
data block;
}

My questions are:
1. this application sometimes hang-up. I can see it from 
oscillograph (because my device set off the ExtInt when I read 
all data from it (48 byte)). It looks like sometimes 
ExternalInterruptEvent dont see that there is a signal on 
ExtInt.It continue to hang-up for 300 ms (maybe a little 
more). So I dont see one chunk of data. Why???
2. when I begin to send all 48 bytes to CANBus (it happens in 
ExternalInterruptEvent), application begin to hanging-up very 
often. Why???
3. This is the most important question.
After starting the application I watch the size of free RAM by 
console command STATS. Before starting the programm the size 
of free RAM is ~300 Kbytes. After I start it the size is 
decreasing very fast and in 10-20 seconds it reach 50-60 
Kbytes. After that it goes up-down. But sometimes the size is 
less than 10 Kbytes; and when there is no free RAM, my 
programm is terminated :((((( Why my app use so much memory???
Maybe it depends on the problem from first question???

Regards,
Vasiliy
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