Arduino Nano IoT cannot read onboard IMU and analogRead() in the same loop - arduino

Question

#include <Arduino_LSM6DS3.h>
#include <avr/dtostrf.h>
void setup()
{
Serial.begin(9600);
while (!Serial); // wait for Serial
if (!IMU.begin()) {
Serial.println("Failed to initialize IMU!");
while (1);
}
Serial.println ("Starting");
}
void loop()
{
char msg[100]="";
char msg2[100]="";
char buffer[8];
char buffer2[8];
readIMU(msg,buffer);
readFlex(msg2, buffer2);
Serial.println(msg);
Serial.println(msg2);
delay(1000);
}
void readIMU(char message[100], char buffer[8])
{
float x,y,z,x1,y1,z1;
if (IMU.gyroscopeAvailable()) {
IMU.readGyroscope(x, y, z);
dtostrf(x, 4, 2, buffer);
strcat(message, buffer);
strcat(message, ", ");
dtostrf(y, 4, 2, buffer);
strcat(message, buffer);
strcat(message, ", ");
dtostrf(z, 4, 2, buffer);
strcat(message, buffer);
strcat(message, ", ");
}
if (IMU.accelerationAvailable()){
IMU.readAcceleration(x1, y1, z1);
dtostrf(x1, 4, 2, buffer);
strcat(message, buffer);
strcat(message, ", ");
dtostrf(y1, 4, 2, buffer);
strcat(message, buffer);
strcat(message, ", ");
dtostrf(z1, 4, 2, buffer);
strcat(message, buffer);
strcat(message, ", ");
}
}
void readFlex(char message[100], char buffer[8])
{
int value = analogRead(1);
ltoa(value,buffer, 10);
strcat(message, buffer);
strcat(message, ", ");
delay(10);
value = analogRead(2);
ltoa(value,buffer, 10);
strcat(message, buffer);
delay(10);
strcat(message, ", ");
delay(10);
value = analogRead(3);
ltoa(value,buffer, 10);
strcat(message, buffer);
strcat(message, ", ");
delay(10);
value =0;
value = analogRead(4);
ltoa(value,buffer, 10);
strcat(message, buffer);
strcat(message, ", ");
delay(10);
value =0;
value = analogRead(5);
ltoa(value,buffer, 10);
strcat(message, buffer);
strcat(message, "\0");
delay(10);
}
If I comment out the either the readIMU() or readFlex(), the other works fine. But if I uncomment both function, the readIMU() seems to not read value anymore and keep print the same value every loop like below with the exception of the first loop() . The only exception that it work is that if I only read A1 and A2, issue occur if it reads A3-A5 as well. I only put in the post the IMU reading. Am I missing anything here?