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Current during notification

I am working on a project with a nRF51822 on a custom PCB. The application is based on the ble_app_template-project from SDK 10.0.0 and I am using S110.

Now I want to measure current during BLE activity. The notification were enabled at 328.5, 362.2, 395.3 and disabled at 358.6, 392.2 and 425.4. The timer interval is 5 seconds. Obviously, there is an unexpected high current during the first timer period after enabling notification. What is the reason for that?

Current during notification

Update

Here are two more detailed plots from a new measurement. Additionally, I added some datatips. Due to a too low sampling rate not all notification peaks are visible.

Current during notification First timer period

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