ESP32-EVB EN pin

[harryweb]

HI,
I made a PCB inspired with ESP32-EVB (I bought I version). Using LAN et some GPIO for SPI.
Power is made by USB connector.
When I upload my program with platformIO everything is OK on both cards, My program is booting and working (Original and mine).
If I just plug my power source (USB) it works fine on Olimex PCB but it doesn't boot on my PCB card. 
I found a way to make it boot just short circuit (pulse) the EN to ground (There is no button on my card)
With the DSO I can see that EN pin is pulled low 100mSec at the end of uploading but not when only plugged to power... (On both cards).... many many hours without finding what's wrong... before making/adding a new pulse reset after powering with pic10f or 555 timer, I ask for some ideas to help me. regards

[olimex]

what is "inspired" did you copy completely or made modifications? hard to speculate what is wrong if no schematic