Integration with Lutron QSX

We are integrating Lutron QSX with HA and it is successfully working with 350 devices for a while but has we increase the no. of devices the it is not responding, it says initializing and then failed, so as i gone through logs it shows this "Reconnecting after error: Separator is found, but chunk is longer than limit" , So anybuddy face this type of issue ?.. pls let me know