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This is a common issue with this GPS device. When you press the power button briefly, it is just putting the device to sleep and then waking up when you press it again. Please, press and hold down the power button for 15 seconds or until it completely shuts off. Once it is off, press and hold the power button for a couple seconds to turn it back on. Doing so, will clear the faulted software issue and start working again.
I look forward to hearing your feedback concerning whether or not your problem is fixed.
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