If you don't get the answer here, you might try the SharpCap forum
In addition to having the error dialog boxes, you should have the SharpCap session log. It might be helpful to change the default logging setup first. From the top menu in SC select File, then SharpCap Settings, the the Logging Tab. On the logging tab check General and Mount Hardware Communications. Do this before starting the camera.
After the error dialog box is closed go to the top menu and select Help and then Show Log.
Always good to have the latest version of ASCOM installed and double check to see that you have the latest drivers for your devices.
You also have the option to run the ASCOM Diagnostics and the device connection checker, but I don't know whether that is going to be helpful.
PhD2 has this to say about connection problems-
If you're using an ASCOM connection to the mount, be sure the COM port assignments are correct. You can also use some of the ASCOM-supplied tools like POTH to be sure the ASCOM driver is communicating correctly with the mount. It is best to use the latest version of the ASCOM driver for your mount because older versions of these drivers might have bugs associated with pulse-guiding.
You may find more at https://openphdguidi...g/getting-help/
Edited by barbarosa, 25 July 2021 - 04:34 PM.