What region are you located in, and What version hub are you using?
Currently Firmware updates are being pushed out today for V2 and V3 Hubs.
You can continue to monitor the status of the Firmware update push here at this link: https://status.smartthings.com/incidents/g952whpqrk82
The page will be updated once it has been completed.
If your issue is not described in this status notification, I would recommend submitting a support ticket for further review.
If you are using an Android Device, you can also try clearing the cache of your Smartthings Application and restarting the device. The pathway is as follows on Android Settings>Apps>Smartthings>Storage>Clear cache and restart your device.
I hope this message finds you well!