Having a random number as a parameter to any block will change the model checksum each time it is compiled. This change can be verified using the simulink.blockdiagram.getchecksum function.
https://www.mathworks.com/help/releases/R2022a/simulink/slref/simulink.blockdiagram.getchecksum.html
Removing the "rand" command and giving a constant value instead will ensure that the model checksum does not change.
