I’ve been using August Smart Lock Pro (zwave) for a couple years with no problems and then a couple months ago, they stopped working. Apparently, many people are having this problem and it appears to caused by a recent firmware “upgrade” that was needed for “security reasons” according to August. See this github thread for more information. If you are having trouble with August, please contact their support to complain about it. Or better yet tweet to them about it here: @SmartLocProject