Dexcom G6 Accuracy Beyond 8 days

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Tandem X2 not communicating with DexcomG6

Anyone else having issues with their Tandem X2 communicating with their Dexcom G6? When I use the Dexcom receiver, it communicates fine with the transmitter up to 15 yards away. When I switch the receiving the Tandem pump if often shows a lost communication from 1 foot away. All batteries are fully charged.