This is a baud rate mismatch or a driver conflict. First, ensure you are not running two applications accessing the same COM port. Second, lower the baud rate to 2400 or 1200 to test stability. If it stabilizes, your driver is crashing under load. Reinstall the driver using the "Clean" option (CH340 driver has a -clean parameter).
Before diving into the software, it is important to understand the hardware. The modern network environment has evolved. Older laptops and workstations featured built-in serial ports (DB-9), but modern ultrabooks and MacBooks have shed these legacy ports in favor of USB-A and USB-C. moyina usb console cable driver
Unlike expensive brands that bundle drivers on a mini-CD (which no modern laptop has), Moyina relies on standard chipset drivers. You will find a file called "Moyina_Driver.exe" on their official site. Instead, you need the generic driver for the chip inside. This is a baud rate mismatch or a driver conflict