Slow response times

I have several zwave switches that have been working great for years on a v2 hub. Recently I’ve seen slow response times via Alexa and the app. Lights will respond 30+ seconds after the command is given. I have some open/close sensors that trigger lights on/off and the response of these are extremely slow as well. It used to be instantaneous. Any ideas? I’ve tried resetting the automations, restarting the hub, Alexa, etc.

Zwave repair? Check for ghost devices after you run it.

I tried that as well. No luck.