We are using FPGA 10M25SAE144C8G for our project. We have seen few FPGA failure in the PIN which are connected via SDI, SDO and CLK line of FPGA pin with External ADC ADS7952 IC. Please let us know if you are suggesting some circuit modifications here. I have attached the releted circuit f FPGA pin connection with External ADC circuit ( attached).
Also let us know if you need more information to solve the problem.