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TPS63050EVM-679: TPS63050 Oscillation and overconsumption

Part Number: TPS63050EVM-679
I have been testing the evaluation board with a Li-ion battery and CC2530 microcontroller.
When the battery goes down 3 [v] the integrated one starts to oscillate by turning off my microcontroller, in addition to that a high tone from the IC is omitted and the circuit consumption increases from 50 [mA] to 80 [mA]

Is this expected result of this IC?

How can I reduce the consumption of the integrated?

 regards