To me this tends to confirm that the root cause of this behavior is network congestion related. As congestion can be caused by any/all the devices, my suggestions above regarding the Zooz devices and rule timing could help (without an investment in new devices).
Might want to review this posting for other ideas [SOLVED] Unresponsive Z-Wave Network: Tools and Approaches to track down the issues - Tutorials & Examples / Solutions - openHAB Community