Symbols scaling crash

[Miguel de la Fuente]

Hello everybody, I've got a problem, I've a layer defined as Line with
simbology, that doesn`t appear as I've expected to, only looks like I want
when I zoom in very much.

I've defined the layer as follow

  LAYER
    NAME "Secciones Lineas"
    STATUS ON
    DATA "new_geom FROM (select OID,* from seccion) as foo using unique OID
using srid=-1"
    TYPE LINE
    CONNECTIONTYPE POSTGIS
    CONNECTION "user=xxx password=*** dbname=xxx host=**.**.**.** port=5432"
    MAXSCALE 10000
    CLASS
      NAME "Secciones"
      STYLE
        SYMBOL "secciones"
        COLOR 0 0 0
        SIZE 5
      END
    END
  END

And its symbology:

SYMBOL
  NAME 'secciones'
  TYPE ellipse
  POINTS
  1 1
  END
  FILLED TRUE
  STYLE
     1 10 20 10 1 10
  END
END

Why when I zoom out does this layer crashes???

I've atteched two images as example, as you see in 'muestra1' the same layer
(non-continuos black line) doesn't even seems regular, and in 'muestra2' is
when I zoom in and the layer is well drawn.
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