You have a ProxySG deployed in GCP and the ProxySG is experiencing unexpected restarts or is in a reboot loop.
From the serial console you are seeing messages similar to:
Error: Hardware fatal error, attempting core image write on processor 2 with exception 0xd
The only resolution to the issue once encountered is to recreate a new GCP ProxySG instance.
If you are not yet seeing this issue, it is important to be on a release that supports the changes made to GCP.
Upgrade to 184.108.40.206 at your earliest convenience to address this issue.