@Mathea90 did you find a solution for this? After enabling MY_RX_MESSAGE_BUFFER_FEATURE my Serial gateway stops receiving messages. it usually takes about 8 to 12 hours. i'm using NRF24L01+LNA+PA and arduino nano. when i added the buffer feature, i felt like my nodes were working better so i would like to keep using it, however with lockup it makes it useless. thanks

@neverdie one of the other components is a MOSFET and I guess it is used as reverse polarity protection. Advantage of this MOSFET is the low voltage drop compared to a rectifier. I didn't check the circuit in detail though

@TheoL Hm yeah I guess that makes sense. The point with the future updates is a good one and I think I will now try to alter the structure in my controller to fit my needs. Thanks for the input!

Guys, I found a solution for my problem! I tried everything from soldering the two GND pins of the Arduino together to an additional small condenser but nothing worked. So just for the heck of it I connected my buck converter to the RAW pin of the Arduino and adjusted it to something between 3,5 and 4V. Now my stepper driver and the transceiver both are supplied with power from the Arduino VCC pin and it works 100% reliable. So my conclusion is that the Step down converter of the Arduino conditions the 3.3V better than the buck Converter and this solved all my receiving problems. I don't like that I now have an additional conversion step in my power supply but honestly at this moment I don't bother anymore because I'm just happy to have it finally working. I thank you all very much for your Input!