Similarly not wanting to hijack this thread, but this behaviour's cropped up elsewhere including my own ongoing thread covering off/ons on a C-7.
From that I'm testing whether eliminating unplugged devices and/or custom drivers helps (so far, the former's been discounted), but if @kkossev's theory does prove to be the underlying cause I'm not sure the off/on's can be reliably prevented. On my system (for example) none of the RM5 rules are triggered when the house is quiet, the only current LAN integration is a single Kasa WiFi outlet, so the overload's being caused by...multiple Zigbee devices sending in status reports at once? If so tweaking reporting settings or having fewer devices would at best reduce, rather than eliminate, the chances of a clash.
