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Hello. Please make sure that the handset is within 33 feet of the base unit, and as well if it is properly registered to the base unit. You can review the registration steps at the following link https://help.panasonic.ca/viewing/ALL/KX-TGD510/OI/TGD510_PNQX8349ZA/TGD510_PNQX8349ZA.pdf#page=25 -G
Sorry, there was a problem. Please try again later.Sounds to me like you need to take it back to Best Buy. I would way it's defective, can't think of any way you can do anything.
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