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S132 sd_app_evt_wait() blocks for seconds during connection

I am running an appliction with S132 soft device, build on top of SDK 12.0.0. Problem is that the application sometimes stops running for ten seconds, or even more, when Bluetooth connection is established. According to my debug-prints it looks like sd_app_evt_wait() just blocks. I have an app_timer running at the rate of 10 Hz, but this doesn't wake up system from the sd_app_evt_wait() in that case.

Is that normal behaviour of soft device S132, or what could cause the problem? Any hints to overcome the problem? In the phone end Android application thinks it is connected, but no data comes in, except the battery value. I am using Nordic UART service ("nus") to send out data from the nRF52832.

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