[CentOS] systemd

Hi All -  I have a systemd service file to start my application.

Part of my service file is:
[Service]
Type=forking
ExecStart=/path to start
ExecStop=/path to stop
RemainAfterExit=yes

This works fine "normally".

However - when I do a "yum update; and reboot"  my script detects a kernel
change and now does a number of "recompiling" steps for drivers and such
before starting my application. Somewhere along the way that just stops.
I'm half way into recompiling those drivers and it just stops.

Is there something else I need in the service file ?

Thanks

Jerry