RBoy
(www.rboyapps.com - Making SmartThings Easy!)
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Ensure that your lock is no further than 20 ft from the nearest repeater. You need atleast one repeater (Z-Wave Plus or ZigBee depending on your lock) between your lock and your hub to create a mesh and it will resolve 99.99% of your issues.
A repeater is any mains powered ZigBee or Z-Wave Plus device (like a switch or a plug), for example the Monoprice plug
See this topic for more details as to why hubs don’t function efficiently with locks without repeaters: