If I kill MyProcess using Task Manager, no problem. But if I do a shutdown of my computer, I got a "Cannot Quit Visual Foxpro". What is missing in my code?

*** MyProcess.PRG
_screen.Visible = .f.
oService = NEWOBJECT("vfpsvr")
IF _vfp.StartMode > 0
...READ EVENTS
ENDIF
CLOSE ALL
RELEASE ALL
QUIT

DEFINE CLASS vfpsvr as Form
...PROCEDURE Init
......this.AddObject("mytimer","mytimer")
......WITH this.mytimer
..........enabled = .t.
..........interval = 900000
......ENDWITH
...ENDPROC
...PROCEDURE Destroy
......CLEAR EVENTS
...ENDPROC
ENDDEFINE

DEFINE CLASS mytimer as Timer
...PROCEDURE timer
......IF BETWEEN(DOW(DATE()),2,6) AND BETWEEN(VAL(LEFT(TIME(),2)),6,17)
.........this.Enabled=.f.
.........DO MyProcess
.........this.Enabled=.t.
......ENDIF
...ENDPROC
ENDDEFINE

PROCEDURE MyProcess
...
...
ENDPROC