I would recommend the following steps:
- Reboot the hub (important)
- Exclude the lock
- Reset the lock to factory defaults
- Do NOT use the Generic Z-Wave device option for this lock. In the new ST app, click +, click Devices, click on Scan nearby at the bottom and use that to pair the lock.
Note that there is an issue with the FE599 and the hub firmware which is preventing the lock from sending real time updates to the hub (lock, unlock, code usage notifications, battery etc). We have worked with ST to fix this and it’s the final stages of testing. It should be out in the next week or so and will help restore the notifications for this lock (v0.31.x).
If you’re using the latest version of Enhanced Z-Wave Lock device handler, then you’re good and it’s ready for the new hub firmware. Once the hub firmware is released all you’ll need to do it open the settings page and tap Save and the notifications should start working.
And ofcourse do add a buffering device as @TonyFleisher pointed out, it’ll go a long way to improve your lock stability.