Z-Wave network on my Vera3 hangs intermittantly

I am experiencing an intermittent hang of the z-wave network on my Vera3. It has happened about 3 times over the last few months. When this happens I am unable to operate any of my z-wave devices (i.e. switches or Tstat) from the dashboard or via a lua script. The devices will do several retries, and then give up.

I have been able to get it going again by logging into the system with Putty and doing a ?reboot?. Thankfully I haven?t had to power cycle the system as it is in a remote location and I am not set up to do that remotely.

I am running UI5 with 1.5.622 FW. Have others run into this issue before?