I don't think there's anything wrong with Poller, it happens if you refresh the devices frequently too. My theory is that something weird happens when you flood the Z-Wave mesh with frequent traffic, but I have nothing firm to back that up. I started a thread (link below) a couple months ago with my experiences. There really wasn't a resolution, so I ended up replacing the couple of devices I relied on for triggers with Plus devices, then setting up rules for the rest (30 devices) to refresh one per minute. Haven't seen any issues since, other than delayed device status updates.
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