That’s the crux, if no events are coming then the mesh is losing it somewhere.
I’m noticed that you’re using the older GE/Jasco Z-Wave switche. These tend become problematic. ST’s engineers have noticed issues with overheating and we’ve seen other issues in our labs (I wrote about it on a Z-Wave repeater topic).
I would recommend either switching to the newer GE Z-Wave Plus switches or resetting the switches (use the air gap if it’s there otherwise cut the mains for a few seconds). Then reboot the hub and do a Z-Wave repair. Worst case you may need to exclude the older Z-Wave switch from your network, do a Z-Wave repair.