I do not believe that Voln symbols should be able to be dispelled by bandit's yet I had this happen tonight, I was advised to post it on the forums
Had a bandit dispel me and with it he took Symbol of Courage

A half-elven marauder pulls out a tiny shard of jet black crystal and hurls it at you!
The crystal shatters against your body and releases a pulse of anti-magic!
You no longer bristle with energy.
You feel the extra courage wane.
The glowing specks of energy surrounding you suddenly shoot off in all directions, then quickly fade away.
The powerful look leaves you.

To the best of my knowledge voln symbols should not be dispellable

You also see the Shilarra disk etched with the image of a Vathor

AFAIK thats normal. Its certainly normal for bandits, and Voln symbols get knocked down by other critter and player dispels too.

...

Being on fire is a guess the verb puzzle.

This would probably make a lot more sense under the Voln society topic rather than the Voln arkati topic. Also this is not just a Voln problem. GoS sigils get removed by bandit crystal dispels and Confluence elemental dispels.

Keith/Brinret/Shiun

Brinret says, "Bring it on."
A bolt of lightning streaks down from the sky and strikes Brinret!
... 16428101 points of damage!
Powerful blast reduces Brinret to a smoldering pile of ash!