Sorry to hear the problems you are having with that instance.
We checked our system logs. The last action on the machine is a reboot, just as you said, and the machine got marked as deleted before performing the reboot. This is because we try to refresh the instance state before executing the operation, and in this case our system was not able to find the instance. This caused the machine to be marked as deleted on our side. We have also verified that there are no other operations before that reboot, other than some instance state refresh.
We have also detected that our system got an error regarding your project API availability a couple of days ago. Have you modified any Google project settings recently?
Access Not Configured. Compute Engine API has not been used in project 116438511931 before or it is disabled.
Unfortunately, we can't verify the real status of the instance on our side, nor recover any deleted servers. Can you please make sure that the machine is not shown in your Google console? In theory, it should appear in this URL:
If it is not there, then it means that the machine was deleted from outside the Bitnami Launchpad for Google. You can check the project activity, to detect when did it exactly happen:
Please check it out and get back to us if we can be of any further assistance.