Thank you for your provided information.
In this case, we could recommend to update your FMB120 unit into the mentioned newest base and check if this behavior is the same as with the current. But we would like to inform you that we do not share firmware files/updater and other files in the community forum. To receive firmware files, updater and documentation on devices, please contact your sales manager.
If you don't have any contacts with our Sale managers, please contact with them on our official website https://teltonika-iot-group.com/
and click on the "Contact Us" button. When you will click, please fill the form and submit it.
Note: as a topic, please choose "Vehicle telematics".
Best regards,
Teltonika Support