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May I ask for a clarification of what the primary problem is with your GPS unit?
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If the two devices are connected by Bluetooth connection, a setting to pair-and-connect automatically may have spontaneously changed, requiring that they be matched (or paired) frequently. I suggest setting up the pairing and connecting between them to be automatic, all over again, from scratch. Or going through the settings carefully and looking for an 'automatic pairing' option, and enabling it.