Hello Pekka,
Thanks for reaching out. Heartbeat Stalled means that the status heartbeat from the engine isn’t making it back to the transform.client successfully.
This could be for a variety reasons (for example the stability of your network connection), and we have various fixes for this due to be released in v1.1 in the coming weeks.
In the meantime, closing and re-opening the client should help.
Please don’t hesitate to reach out for anything else - or ping us an email at support@fourieraudio.com and one of the team will get back to you ASAP.
Henry