VGA output jumps between External Monitor and Satellite L505

I have a Satellite L505-144 linked to an external VGA monitor via a 2 way Aten KVM switch.
Intermittently the external monitor screen will go black, the picture will transfer to the laptop monitor for a second before reverting back to the external monitor. This does not seem to be triggered by any particular keyboard or mouse action and does not seem to be time linked.
The keyboard and mouse connected to the KVM seem unaffected. I have the latest video, motherboard bios and all the latest Toshiba released drivers loaded.
To test the KVM I have connected up a Toshiba NB200 in place of the L505, the problem stops, replace the L505, it comes back.
The issue is not effected by having a second PC connected to KVM. I have tried with a second PC on and off, connected and unconnected, still no change to the problem.
I have switched the KVM cables around and the problem persists and follows the L505. If I connect the L505 directly to the monitor the problem goes away!
I can conclude its an issue between the KVM and the L505.
Is there a known fix or work around?
Is there any guarantee if I get say a Belkin KVM this issue with the L505 will not occur with that equipment as well?

At first I must say that I dont think Toshiba will offer fix for this. Toshiba doesnt support usage of third part products so if there is some possible fix or work around ATEN should know this.
Connect all external devices you use directly on your Satellite L505, test functionality and let us know f you have some similar or any other problem.

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