Communication code between nrf24l01's suddenly not working. Hardware is fine

Question

I specifically had saved code for the purpose of checking the connection, but it doesn't seem to work anymore.

All the examples from this simple tutorial work, so it can't be a hardware issue.

Maybe someone can find a reason why the code wouldn't work? It returns radio.available() as false

//Transmitter
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

RF24 radio(7, 8); // CE, CSN
const byte addresses[][6] = {"00001", "00002"};
float valueTransmit;
float valueRecieved;

void setup() {
  Serial.begin(9600);
  radio.begin();
  radio.openWritingPipe(addresses[1]); // 00002
  radio.openReadingPipe(1, addresses[0]); // 00001
  radio.setPALevel(RF24_PA_LOW);
  valueTransmit = 0
}
void loop() {
  radio.stopListening();
  radio.write(&valueTransmit, sizeof(valueTransmit));
  delay(5);

  radio.startListening();
  if (radio.available() ) {
      radio.read( &valueRecieved, sizeof(valueRecieved) );
  Serial.print(valueRecieved);
  valueTransmit = valueRecieved + 0.01;
  }
}




//Reciever
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

RF24 radio(7, 8); // CE, CSN
const byte addresses[][6] = {"00001", "00002"};
float valueTransmit;
float valueRecieved;

void setup() {
  Serial.begin(9600);
  radio.begin();
  radio.openWritingPipe(addresses[0]); // 00001
  radio.openReadingPipe(1, addresses[1]); // 00002
  radio.setPALevel(RF24_PA_LOW);
}
void loop() {
  radio.startListening();
  if (radio.available() ) {
    radio.read( &valueRecieved, sizeof(valueRecieved) );
    Serial.print(valueRecieved);
    valueTransmit = valueRecieved + 1;
  }
  
  radio.stopListening();
  radio.write(&valueTransmit, sizeof(valueTransmit));
  delay(5);

}