Why Simulink/MATLAB crashes when configured for multi-user transmit beamforming with two X310 USRPs?

Hi,

I am using two X310 USRPs to be configured as bundled radio. I have successfully done 2x2 MIMO with two X310 USRPs connected separately to two host PCs and when connected to single host over two NICs. I want to establish multichannel 4x4 MIMO system with frequency and timing synchronisation signals supplied from Octoclock-G. I want to test multi-user transmit beamforming example available at following link:

• https://uk.mathworks.com/help/supportpkg/usrpradio/examples/multi-user-transmit-beamforming-with-usrp-r-hardware.html

This example clearly says it requires Communications Toolbox Support Package for USRP Radio. Can anyone please comment why Simuink/MATLAB crashes? I face this problem when I run this example as well as when I configure SDRuTransmitter and/or SDRuReceiver to four channels. I face this problem in both situations when I configure the system on Windows or on Ubuntu 18.04.

Regards

Mir Lodro