Such disconnection behaviour may be connected to the administrator privileges settings.
Try to check if the X-solver run with the same administrator privileges of the StarGo software (see attachment, in our case works fine with both tools "without administrator privileges").
However, are you using the X-solver for Polar Align? Just to understand if is an issue connected to the X-solver, did you try to use an alternative method such as the PHD2 drift align tool?
Below you can see a tutorial made from an Avalon user about this tool with the StarGo.exe, that shows how to easily perform the Polar Alignment adjustment.
You can try in this way and let us know about it.
