Issues with Creating OCI Instances: “Out of Host Capacity” and “Shape VM.Standard.A1.Flex not Found”

I’m trying to create instances using my script, but I’m encountering a peculiar issue where it’s either successful or fails. What could be the reason behind this alternating success and failure? (Extracted from parts of oci.log). { "code": "InternalError", "message": "Out of host capacity." } { "code": "NotAuthorizedOrNotFound", "message": "shape VM.Standard.A1.Flex not found" } { "code": "InternalError", "message": "Out of host capacity." } { "code": "NotAuthorizedOrNotFound", "message": "shape VM.Standard.A1.Flex not found" } { "code": "InternalError", "message": "Out of host capacity." } { "code": "NotAuthorizedOrNotFound", "message": "shape VM.Standard.A1.Flex not found" }