I had a similar problem. It was a combination of the S0 security and an overly chatty zooz Zen25 Double plug. Got rid of the double plugs, updated the firmware on the bulbs (2.31), and reincluded non-secure, they have been rock solid for close to a year now. A few weeks ago I attempted to reinclude those Zen25’s after all the recommended tweaks to disable energy monitoring and updating the firmware. within 72 the Zwave was starting to fail. took those Zen25’s out, the problem quickly corrected itself. The moral of the story, the bulbs are fine, but stay away from those Zen25’s, at least with the C7 hubs.
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