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serial LTE modem bricks

Hello. For a long time I see that nrf9160 Serial LTE modem examples are not stable, tested few times in a year.At very begininng   I have customized for my  own needs SLM application and it works fine (2020 May source code). At least it works stable with 460800 baud rate, standard AT#XSEND, AT#XRECV commands.
But now I wanted to find out new updates in this SLM firmware and test it with nrf9160 B1 new hardware. It is not stable at all. Just bricks randomly on AT#XRECV =0 (with zero timeout),modem becomes unresponsive to any other AT command...
I am using latest modem firmware 1.3 and latest (July 20 available) source code from

origin    github.com/.../sdk-nrf (fetch)
origin    github.com/.../sdk-nrf (push)

master branch

I have b1 and b0 HW revisions nRF9160 dev kits. Both behaves similar, just randomly bricks on
AT#XRECV =0 command.

When I am changing baud rate of UART communication higher than 115200b/s modem bricks fasterm even after few received bytes with AT#XRECV =0 command...

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