No LTE connection

[Vojislav]

I have developed a new board based around NRF91 module. Ten prototypes are produced and six of them work. Other four devices cannot connect to the LTE network. I am using the at_client example with nRFconnect v3.0.0 LTE link monitor, and the device is always searching, but cannot find the network. 

Here is the picture of the link monitor window and current consumption while searching for the network. 
I know this is most likely a soldering issue, but I have resoldered antenna part many times and still nothing... Do you have any suggestion about what could be a problem?

[Vojislav]

Hi Martin,

We have managed to get rest of the boards working after resoldering them a few times. Also, we put the new version fo the firmware on them, and they work with application firmware.

Best regards,
Voja