It is very important that you shut down your Maximumsettings gaming system properly before exiting your Moonlight Streaming client.
Please also keep in mind that we are still in "beta" mode -so while things are almost perfect, there are still things that may not be! That said, we would also love to look into this issue. Please send us a support ticket with your cloud gaming PC ID or IP.
Please submit your ticket at https://support.maximumsettings.com/