Upload timeout and green and orange LED are On

Hi !
I recently tried to upload my sketch to my Xiao.
The first try succeeded (confirmed by the serial monitor which returns me some data).

But when I try to upload a new time, it timeouts (“No device found on COM3”).

When I plug the XIAO on the USB, the green and orange lights are On (not blinking).
The XIAO is recognized by the Arduino IDE.
Here is the code I uploaded : https://github.com/samy/customizable-color-lamp/blob/master/customizable-color-lamp.ino

I tried many resets, without success