ADR4525, ADR130

Hi ,

I am using ADR4525 as a 2.5 V reference and ADR130 as 1V reference .I understand the maximum junction temperatures of these parts cannot exceed 150C but I intend to test at 175C for few days 

The input voltage for ADR130 is 2.5V from ADR4525. When I increase the temperature above 170C , I observed the output of ADR4525 going to 0V. I would like to know if the behaviour is coming from ADR4525 or ADR130

Could you help to answer this ?