无法向Arduino发送超过64字节的数据

Question

我需要从PC与Arduino通信。

我有C＃代码。我向Arduino发送了87个字节。

C＃代码

byte[] MyBuffer = new byte[87];
// I initialize buffer with bytes(0-255) details are not important.
serialport1.Write(MyBuffer, 0, 87);

Arduino部分是最重要的。因为我要将这些字节分成5个不同的数组。

byte FirstBlock[16];
byte SecondBlock[16];
byte ThirdBlock[16];
byte FourthBlock[16];
byte FifthBlock[16];
byte ReceivedBuffer[87];

int counter = 0

bool SYNC = false;

void loop(){
if(Serial.available())
   CropBytes();

if(SYNC == true){
   SplitBytes();
   DoSomeStaffWithBlocks();
   SYNC = false;
} } //End Loop

void CropBytes(){
   while(Serial.available()){
       byte ReceivedByte = Serial.read();
       ReceivedBuffer[counter] = ReceivedByte;
       // byte 35 means my byte transfer is over for ReceivedBuffer[86]

       if(counter == 86 && ReceivedBuffer[counter] == 35){
             SYNC = true;
             counter = 0;
        }
        else{
             counter = counter + 1;
        }
    }
}

void SplitBytes(){
  for (int i = 5; i < 21; i++)
  {
    FirstBlock[i - 5] = ReceivedBuffer[i];
  }

  for (int i = 21; i < 37; i++)
  {
    SecondBlock[i - 21] = ReceivedBuffer[i];
  }

  for (int i = 37; i < 53; i++)
  {
    ThirdBlock[i - 37] = ReceivedBuffer[i];
  }

  for (int i = 53; i < 69; i++)
  {
    FourthBlock[i - 53] = ReceivedBuffer[i];
  }

  for (int i = 69; i < 85; i++)
  {
    FifthBlock[i - 69] = ReceivedBuffer[i];
  }
}

问题-FirstBlock[]，SecondBlock[]，ThirdBlock[]成功收到没有问题。但是在ThirdBlock之后，FourthBlock（第11个字节之后）和FifthBlock（所有字节）数组不能成功初始化。

我不知道问题出在哪里。