Paring fails when temperature difference becomes > 40 C

Our Gateway uses a NRF52 and the sensors a NRF51.

Gateway is outside the freezer at + 20C and the sensor is inside the freezer at -30C.

What we see is the pairing becomes more and more difficult is the temperature difference increases.

Of course we use batteries that still provide enough power at -30C or -40C for the sensor to work.

The beacon signal of the sensor is received by the Gateway but pairing becomes increasingly difficult.

Can there be a timing issue? The sensor listens after every beacon signal and wait for a pairing request.

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