High BLE activity for 15 seconds after connection

[jumpingfool]

I am developing a BLE peripheral application on nRF52832 and SDK 14.3.

I have been power profiling my application and quite happy with the results, except for when the peripheral first connects. Power usage goes crazy for about 15 seconds before calming down again - see below screenshot of the output from the power profiler:

What is the device doing when this happens? The peripheral is connecting to an iPhone and is bonded.

This is clearly BLE activity but I'm pretty sure it has nothing to do with my application!

[Matt]

Is it possible to try connecting using the master control panel on the pc side i.e. just connect, bond, discover service and see if you get the same 60mA current drain on your end.