Problem with Bluetooth when LTE connection

Hi, I have a problem with simultaneously working Bluetooth LE with LTE. I've use nRF52832 as a Bluetooth controller with is connected to nRF9160 via Low Power UART HCI. When I disable LTE connection Bluetooth works fine. When I disable Bluetooth, LTE connection works fine. I don't have a hardware connection between reset line in nRF52832 to gpio in nRF9160. I have set one gpio in nRF52832 to generate interrupt and software reset.

When I run the application with only LTE connection and flash application with LTE connection and Bluetooth, everything works fine until next reset. After that - kernel error occurs.

I try to lower LP UART speed to 115200, but without any change (moreover - when use only Bluetooth - I can't set max uart speed - max baud rate value when Bluetooth works is 460800 ). I'm working on SDK 1.7.
Any suggestion?

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