Fmc 125 Time Sync Issue

[daniyal.bulut]

I’m facing an intermittent issue with a Teltonika FMC125 device and would appreciate any guidance.

Issue description:

• The device sometimes sends incorrect AVL data, including:

  • Wrong timestamp

  • Wrong GPS location

• The reported GPS location is not random; it appears to be a location from several hours earlier (old/stale data), sometimes kilometers away from the current position.

• When I send the deleterecords command to the device:

  • Both timestamp and GPS location immediately become correct

  • This confirms that the device was sending old stored AVL records instead of real-time GNSS data

Additional details:

• This issue occurs periodically, approximately every 15–20 hours

• Between these events, the device works normally

• GNSS signal conditions are good when the issue happens

• No power loss is observed before the problem occurs

Has anyone experienced a similar issue with FMC125 or other Teltonika devices?
Could this be related to:

• AVL record buffering or memory handling

• GNSS data not refreshing correctly

• Firmware-related issues

• RTC / GNSS time synchronization

• Internal record queue not being cleared properly

Any advice, similar experiences, or recommended troubleshooting steps would be highly appreciated.

Thank you in advance.

[Tomas_G]

Hello,

You need to change recorcord sorting from oldest to newest.

GPRS>Records Setting>Sort by>Newest

Setting to the newest device will always prioritize most recent data, and once it has time, it will offload old data to the server

But be sure that the platform is able to sort records based on record time, but not based on the time when the server received the records, as it will ruin the track on the map, and in general will scramble data if sorting by record creation time is not properly implemented in the server