[Xymon] Phantom trap alerts?

We have one class of device (exadata storage cels) , and one single server out of hundreds, for which we occasionally get bogus trap alerts.

We don't use trap alerts at present on *any* devices.

What happens is, we get a trap alert, and then after some time passes it turns purple. Someone gets paged and woken up for the purple which is VERY annoying. I drop it on the xymon server side, and it goes away for days or weeks or months.

I can set a rule to ignore trap when paging, but why are we getting them? The exadata storage cels do not run a xymon client, they are ping monitored only. The lone server does run the linux client. What could be triggering the trap just for these boxes? Has anyone else ever experienced this?