systemd restart=always

 так, памятка чтобы системд вечно рестартил сервис

Необходимо, но не достаточно restart=always :

The default limit is to allow 5 restarts in a 10sec period. If a service goes over that threshold due to the Restart= config option in the service definition, it will not attempt to restart any further.

The rates are configured with the StartLimitIntervalSec= and StartLimitBurst= options and the Restart= option controls when SystemD tries to restart a service.