The problem occurs due to the firmware of the uTrack24. You can roll back the firmware from 3124 to 2193. The firmware is available in the downloads section. Please check the release notes of 3124 to see if you will miss any new features that you absolutely need.
We shall have a new firmware update soon, and we strongly recommend you to upgrade to the new firmware, once it is available. Of course a notification for the new firmware will be sent to all the users.