Hello & Welcome to Just Answer,
Sorry to hear of any issue you are having with your device.
To help you with this issue, may I ask:
1) The FULL Make & Model Number of the device you are working with?
2) The AGE of the device?
Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
Next question, do you have a mac or a PC.. And whens the last time you connected your TomTom to your mac or pc and updated it, or backed it up?