Node to node

Hi i am trying to make a node to node secure and not having much luck
i just have two rf96 on arduino pro mini and i can use the examples sketches from arduino
but if i leave my receiver without a signal for some time it will get a completely garbled screen and can also sound an unwanted alarm which sounds when i get one of my messages normally , does anyone have a suggestion or a place to look for help
Thanks in advance

A forum intended for the support of the Arduino platform would probably be best.

This is a TTN support forum, so not the best place to get support for LoRa node to node or other general issues with Arduino.

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