Sometimes USB transfer data problems occur

[factoryal]

Describe the set-up

• The board (either ST RPN reference or your custom board).
• IDE or at least the compiler and its version. IDE: STM32CubeIDE 1.10.1 MCU: STM32F401RC

Describe the bug I'm testing USB CDC on STM32. The STM32 uses 12Mhz HSE clock, HCLK is 32Mhz. The host PC recognizes the USB device. But sending `"hello world!\n" string repeatedly every about 10ms, the received data by host show message below.

hello world!
hellhello world!
hello world!
hello world!
hello world!
hellhello world!
hello world!
hello world!
hello world!

How To Reproduce

1. Firmware Package version is 1.27.1 (latest at time)
2. Only USB and SWD peripherals enabled. (make sure the right clock configuration)
3. Only this code used on while() loop

   
   #include "usbd_cdc_if.h"
   #include <string.h>

...

while (1) { const char str = "hello world!\n"; CDC_Transmit_FS((unsigned char )str, strlen(str)); HAL_Delay(10); / USER CODE END WHILE /

/* USER CODE BEGIN 3 */

}

**Additional context**
- It also happens when I increase HAL_Delay() to 1000ms.
- It's not a serial terminal error. I tested on Coolterm, Arduino Terminal, node.js serialport package.

**Screenshots**
![image](https://user-images.githubusercontent.com/22570054/188542860-8190d419-2cb4-4975-83af-cc53ed92ef58.png)
![image](https://user-images.githubusercontent.com/22570054/188542869-453f8d70-914f-4bb8-9581-9427c29a4236.png)

[factoryal]

OMG.. I think I resolved this issue. I increased HCLK to 64Mhz and the problem doesn't appears. Why I used 32Mhz is that I first tested on L0 MCU on 32Mhz and it worked well.