Hi there,
Yes , it’s a Process… Post up the code using the code tags above, “</>” paste it in there we can look at it.
Run a slice of code that Identifies the spi pins and the CS it thinks is selected. I would start there.
Like in the flash demo for the expansion board I have on here.
look through the code you’ll see the attention to CS or SS and the pin numbers used.
Serial.println("--------------");
Serial.println(SS_SPI0);
Serial.println(MOSI); // master out, slave in
Serial.println(MISO); // master in, slave out
Serial.println(SCK); // clock
Serial.println("--------------");
typically it’s between the Keyboard and the Floor when it happens to me… 
HTH
GL 
PJ 