Dear,
After leaving my projects unattended for 3 months I was surprised that all my VMs (compute engines) were gone on all my projects.
Also, I had to re-enable the compute engine API on all projects .
The billing acount has not changed and I can see the logs from the VM instances that were there.
What went wrong? How do I prevent this from happening?
NB: Educational support tells me they can’t see into my account due to privacy reasons. As an professor/education I have no idea who can support me in this… 
Kind Regards,
Peter