FP3 Block in boot

I have a problem with my Fairphone 3 under /e/OS. When I turned it on this morning, it was stuck on the start screen (with Fairphone written on it).
I tried to enter the fastboot, the secure boot is disabled and the phone is locked. I also tried to enter the recovery mode, but nothing happened, I found the start screen.
I also tried to find it with my computer (under ubuntu) thanks to the command adb devices, and no phone is found.
What can I do?
Thanks in advance for your help.

Internal memory disconnected from main board ?

How can I know that ?

Was it buyed preinstalled by /e/ ?

No, I Have installed /e/ myself on year ago