A typical problem with Garmin Traffic GTMs cables is the poor contact of the wire with the mini-card of USB connector.
In general the traffic detection system stops functioning. In all cases I had, were several, I solved the problem re-welding the contact.

First step is to make a longitudinal section in the cover of USB connector rubber of the cable to remove it. What remains is a block of plastic / adhesive involving a small plaque on which are soldered some wires. With a blade gently revolve this protection to get on board. Cut the wire ends and solder / resolde again obeying their original positions. Test by moving the wires, make sure this ok and remount the cover.
You can paste and fill the cover with black silicone or similar.


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