The you are using the SmartThings provided device type.
If you feel adventurous, try switching the device type as referenced in the other thread. I am the author of that device type and it was written specifically for the device you are using. Most people who use it find it do be more reliable than the stock “Z-Wave Metering Switch”.
There are several steps to adding a custom device type using the SmartThings developer IDE (which I won’t reiterate here since I am sure someone on this community has a better explanation on how to do it than I will do here). It is not that hard to do to be honest.
Good luck.
James
EDIT: Here is a link to the documentation
EDIT 2: Here is a good article FAQ: An Overview of Using Custom Code in SmartThings