TX1 difficult to power up when PCIe is loaded with FPGA or graphic card

We have power up issues for all our TX1s on Nvidia carrier cards and TX1s on CEI carrier cards. Power buttons need to be pushed multiple times when PCIe is loaded. CEI carrier card can auto power up without PCIe card but failed to power up with PCIe card.
How can the issue be solved by hardware or software?
Can small delay be added to PCIe power up?

Did you try changing C36 to 0.1uF as this topic said?