That same thing happened to my toadstool about 7 months ago. Poof! Just disintegtrated. I never did figure out what caused it but in the end I had to just cut it off at the base before it crashed the tank (it is not growing back from the little bit I left on the rock). If they look like they're circling the drain I'd just rip them out of there before they cause issues for everything else.
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