Answer: The device may lose power temporarily and reconnect when the battery is restored.
What matters is what happens afterwards
Check that the app or device reconnects normally. Keep the garage invoice if the interruption coincided with repair work. If the insurer reports missing data, you then have a clear reason rather than an unexplained gap that could look like tampering.
A temporary loss of power is usually explainable
Battery replacement, electrical repairs and some workshop procedures legitimately require the battery to be disconnected. The telematics unit may simply stop recording until power returns.
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