analog input to ADS1262

I am interfacing ADS1262 with Arduino mega2560 along with TFT, sd card and AD420.
The example given in library GitHub - Protocentral/ProtoCentral_ads1262: https://www.protocentral.com/breakout-boards/1005-protocentral-ads1262-32-bit-precision-adc-breakout-board.html for ads1262 is working perfectly but when I interface ads1262 with other slave at that time, sometimes it activate and given output and sometimes it does not activate so not getting serial output.

I am not getting the reason why so happen.