Comment # 8 on bug 941106 from Dr. Werner Fink

(In reply to Stefan Hundhammer from comment #7)

> Better yet, systemd should not try forever to restart *anything*, or at least 
> drastically increase the interval between attempts after a number of failures.

You might set/change DefaultRestartSec in /etc/systemd/system.conf see
systemd-system.conf(5) ... or set per service unit the parameters

  RestartPreventExitStatus=

or even harder with

  Restart=

see systemd.service(5)