random failures to load files

[splace]

have been noticing for a long time. many 100+ occurances

...
Done loading image 'https://vrml2.github.io/tnakgame/corv04d.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/corv04c.jpg'.
Done loading image 'file:///app/share/titania/linetype/1.png'.
Done loading image 'https://vrml2.github.io/tnakgame/metal3c.jpg'.
Couldn't load URL 'https://vrml2.github.io/tnakgame/wreck001b.jpg'.
Status: 0, Couldn't establish connection.

Done loading image 'https://vrml2.github.io/tnakgame/noise6c.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/juncam01.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/juncam04.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/wreck003b.jpg'.
...

moments later it loads fine

...
Done loading image 'https://vrml2.github.io/tnakgame/corv04d.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/metal3c.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/camoe02.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/wreck001b.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/corsea3c.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/wreck007a.jpg'.
Done loading image 'https://vrml2.github.io/tnakgame/corv04a.jpg'.
...