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CC2650STK: CC2650STK IO Service initial blinking issue

Part Number: CC2650STK

Hi, I'm developing CC2650STK control code on Windows 10 PC with Visual Stdio and C# UWP.
When I set the configuration (AA66) to 1 at first time, red and green LEDs start to blink quickly, and buzzer starts continuously for 10 seconds.
This happens only at first time. After that, it works well. Can anyone solve this issue?

I checked those two of SensorTag CC2650STK made the same issue.
FW rev. 1.30 (Apr 26 2016)
FW rev. 1.30 (May 23 2016)

Code Summary:
var status = await configCharacteristic.WriteValueAsync((new byte[] { 1 }).AsBuffer());
//It start blinkling here.
status = await dataCharacteristic.WriteValueAsync(data.AsBuffer());