Pxe Container Exits With Exit Code 137 & Restart=always is not being honored

When we stop docker daemon and restart it after sometime, pxe service does not restart automatically.
Issue type: Pxe Container exits with exit code 137 and Restart=always is not being honored.
OS Version: CoreOS v1122.3.0
Docker version: Docker version 1.10.3, build 1f8f545
Systemd Version: systemd 229
+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK -SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT -GNUTLS -ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN

Content of Pxe Service:
[Unit]
After=network-online.target
Description=Start Pxe Server
Requires=docker.service
After=docker.service

[Service]
EnvironmentFile=/etc/environment
ExecStartPre=-/usr/bin/docker kill "pxe-ser"
ExecStartPre=-/usr/bin/docker rm -v "pxe-ser"
ExecStart=/usr/bin/docker run --net host -v /opt/services/core/pxe/config:/opt/pxe-packages --name “pxe-ser” 10.1.1.1/pxe:1.0
ExecStop=/usr/bin/docker stop --time=40 "pxe-ser"
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target

Output of sudo systemctl status pxe.service
● pxe.service - Start Pxe Server
Loaded: loaded (/etc/systemd/system/pxe.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Mon 2017-03-20 18:34:54 UTC; 19min ago
Process: 12849 ExecStop=/usr/bin/docker stop --time=40 montana-pxe (code=exited, status=0/SUCCESS)
Main PID: 12602 (code=exited, status=137)

Mar 20 18:33:43 localhost docker[12602]: Listening on LPF/enp0s3/08:00:27:23:0d:90/10.0.0.0/8
Mar 20 18:33:43 localhost docker[12602]: Sending on LPF/enp0s3/08:00:27:23:0d:90/10.0.0.0/8
Mar 20 18:33:43 localhost docker[12602]: Sending on Socket/fallback/fallback-net
Mar 20 18:33:59 localhost systemd[1]: Started Start Montana Pxe Server.
Mar 20 18:34:14 localhost systemd[1]: Stopping Start Montana Pxe Server…
Mar 20 18:34:54 localhost docker[12849]: montana-pxe
Mar 20 18:34:54 localhost systemd[1]: pxe.service: Main process exited, code=exited, status=137/n/a
Mar 20 18:34:54 localhost systemd[1]: Stopped Start Montana Pxe Server.
Mar 20 18:34:54 localhost systemd[1]: pxe.service: Unit entered failed state.
Mar 20 18:34:54 localhost systemd[1]: pxe.service: Failed with result ‘exit-code’.

For other services exits with exit code is 125 and are in auto-restart mode. I am kind of blocked ? Any help?