Arduino stops responding after writing to I2C - c++

Question

I'm currently experimenting with writing to EEPROMs over I2C. Reading goes fine and I get excellent throughput. However when I try to write to the device, the Arduino stops responding, and I have to reset it in order to get it to work again.
The I2C write also doesn't show up in my I2C debugger.
void i2cWrite(unsigned char device, unsigned char memory, const char *wrBuf, unsigned short len) {
int i = 0;
ushort bytesWritten = 0;
ushort _memstart = memory;
ushort blockSize = 4;
#ifdef DEBUG_MSGS
char serialBuf[255] = { '\0'};
Serial.print("Writing To i2c: ");
sprintf(serialBuf, "%p", wrBuf);
Serial.println(serialBuf);
#endif //DEBUG_MSGS
while (bytesWritten < len) {
Wire.beginTransmission((int)device);
Wire.write((unsigned char)_memstart);
for (int j = 0; i < blockSize; j++) {
Wire.write(wrBuf[bytesWritten + j]);
}
Wire.endTransmission();
bytesWritten += blockSize;
_memstart += blockSize;
delay(25);
}
#ifdef DEBUG_MSGS
Serial.println("\mDone writing.");
#endif //DEBUG_MSGS
}
I'm quite unsure as to what I'm doing wrong. I'm getting the following output over the serial connection:
Write Request Received: Andy
Writing To i2c: 0xa800fd98
"Writing to i2c" always gives the same value, and it always seems to crash straight after.

Answer 1

the error seemed to be located in the loop as the output is
Write Request Received: Andy
Writing To i2c: 0xa800fd98
I'm working here
I wrote the memory adress
I wrote a byte of data
I wrote a byte of data
I wrote a byte of data
I wrote a byte of data
I wrote a byte of data
....
this seems to go on ad infinitum.
After adding a few more debug statements and changing the points Some programmer dude noticed
{
Wire.beginTransmission((int)device);
Serial.println("I'm working here");
Wire.write((unsigned char)_memstart);
Serial.println("I wrote the memory adress");
for (int j = 0; j < blockSize; j++) {
Wire.write(wrBuf[bytesWritten + j]);
Serial.println("I wrote a byte of data");
//Serial.write(wrBuf[bytesWritten + j]);
}
Wire.endTransmission();
Serial.println("I ended the transmission");
bytesWritten += blockSize;
_memstart += blockSize;
delay(25);
}
i noticed that i was checking for I < blocksize (copied from the reading part,) now i'm running into some other (small) issues but this solved the problem i was having.