C7 - Z-Wave Control Issues (Random or extreme delay)

You missed the last step of updating the firmware, which is updating the zip gateway back to 7.18. That probably will not help the issue but you should do it anyway. Updating Z-Wave radio on C-7 hubs after version 2.3.8.122

Other than that, we need to see the full z-wave details page, you may need multiple screenshots.