New ec2 instance provisioning failing

[Žygis A]

Hello, I'm using ansible to launch and provision new ec2 instances and we noticed some strange behavior while launching different types of instances. I tried provisioning multiple m3.large instances while also adding additional EBS volumes (gp2 type, 12GB and 100GB). We noticed that instances came up with all the volumes attached but after a couple of seconds instances were shutdown and then immediately terminated. State transition reason had the following error: Server.InternalError: Internal error on launch. At first I thought that it might be related to some sort of ec2 service restrictions but I then tried to create exactly the same instance using AWS GUI and it worked. I then tried the same setup with t2.micro and it also worked perfectly fine, instance came up with all the volumes with no issues. I also tried to provision m3.large with no additional volumes and this also worked as expected. 

Playbook I'm using:

- name: Provision {{count}} instance(s) in {{region}}

  hosts: localhost

  gather_facts: False

  vars_files:

    - vars/credentials.yml

    - "vars/{{ region }}.yml"

  tasks:

    - name: Create new ec2 key pair with ansible public key

      ec2_key:

         name: ansible         

         key_material: "{{ item }}"

         region: "{{region}}"

         aws_access_key: "{{ ec2_access_key }}"

         aws_secret_key: "{{ ec2_secret_key }}"

      with_file: /root/.ssh/id_rsa.pub

    - name: Launch instance

      ec2:

         aws_access_key: "{{ ec2_access_key }}"

         aws_secret_key: "{{ ec2_secret_key }}"

         key_name: ansible

         group: "{{ ec2_group }}"

         instance_type: m3.large

         image: "{{ ec2_image }}"

         wait: true

         count: "{{ count }}"

         vpc_subnet_id: "{{ ec2_vpc_subnet_id }}"

         assign_public_ip: yes

         count: "{{ count }}"

         region: "{{region}}"

         instance_tags:

             Name: ec2-{{ region }}-node

        volumes:

          - device_name: /dev/xvdb

            device_type: gp2

            volume_size: 12

            delete_on_termination: true

          - device_name: /dev/xvdf

            device_type: gp2

            volume_size: 100

            delete_on_termination: true

     register: ec2

Information that might be helpful: ansible version: 1.9.1 boto version: 2.38.0 Any suggestions on how to solve this?

Thanks!