Mavlink via BT error

I am trying to connect my Scout X4 via the BT adapter that came with it. Some times it connects, most times it doesn’t. When it doesn’t connect it get the same error msg. I think MP is just throwing and error and disconnecting the connection as windows reports the connection before the error.

I am hoping someone can decipher the error msg for me and maybe we can get this to connect every time. I have attached a screen shot of the error msg.

Thank you in advance for any help you may be able to provide.

Maybe this topic is better in the Mission Planner sub board?