Just read on other forums about this same issues with falling out and they also say its the firmware that need to be updated since the older version is spamming the z-wave due to 1w sensitivity reporting among overload of reporting.
I find the following info on my thermostats on the web console:
Raw Description zw:Ls type:0806 mfr:019B prod:0003 model:0202 ver:3.04 zwv:5.03 lib:03 cc:5E,55,6C,98,9F sec:86,85,8E,59,60,72,5A,73,70,7A,43,40,32 role:05 ff:9200 ui:9201 epc:4
So looks like mine might be version 3.04, and latest is 3.6.