RAK5010 issue connecting LTE antenna

I am working on my custom firmware using Arduino framework. I was able to build my application to send MQTT messages over ssl.
But sometimes it happen that the BG96 module goes up and down when the LTE antenna is connected. The blue led is not solid as usual, but periodically around 4/5 sec it goes down and then up. But only when the antenna is connected
Disconnecting the antenna the BG96 works fine, but of course is not able to send data…
Is it possible is an HW issue fo my module? Any suggestion?

Hi. With this ups and downs you mean that the module resets?

the problem happen during the module powerup. No configuration is still send through serial port.

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