I had this problem. Drove me crazy in the car when trying to use Garmin. Had same problem with JasJar but NOT with the K-Jam.
Its not a cable or charger current issue cause most USB ports only supply 500mA.
Try this and see if it works for you as it did me...
Plug in your cig lighter charger, whilst connected, reset the TyTn.
After that, mine started to work fine!! Weird EH? :shock: :shock: