title: Serial Communication on Windows 7 via Bluetooth has intermittent data loss
body: <p>Currently I'm working on a portal device, which communicates with Windows via bluetooth serial communication.<br>
  It works fine on windows 10.<br>
  But on windows 7, things get strange, the communication is not stable, sometimes it runs well for a whole day, sometimes it lose data frequently. The bluetooth driver version on two platforms is the same. I have no idea how to solve it.<br>
  Are there any reasons?</p>