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nRF9160 NB-IoT signal strength polling

Hi,

So I am trying to poll the signal strength of the nRF9160 DK and at first everything seems okay, the device gains connection and all the boxes in the LTE Link Monitor go green and can deliver RSRP values but after approximately 1 minute, it loses the ability to read the signal strength(RSRP -> 255). Then I have to reset the device again to read new signal strength values.

I am using a 1NCE sim card and am located in Germany and I have the NB-IoT firmware installed. I am using the AT+CESQ command to retrieve the signal strength information. The screenshots of the LTE link monitor output are below.

thanks in advance!

Dan

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