Alice PCB R3 - USB only sometimes working

[liquidvel]

Hi,
I have the Alice PCB R3 from here. If I plug in the USB cable the LEDs flicker for a second (even shorter) and then nothing happens. I cannot type on it, nothing happens. I figured out that sometimes if I plug it in a specific direction, very slowly or change the cable it sometimes works. When it works than I can wiggle on the cable as I want, it still works. But I cannot simply plug in the USB and use it right away.

Did you guys experienced something like that before? What can I do about that? Can the USB Connector be replaced? The are 4 solder points on the back, but the only seem to hold the connector housing.

Please help!

[liquidvel]

For everybody facing the same problem, I've solved it. It was not the USB connector. I did not know that you first had to flash the PCB with
https://github.com/qmk/qmk_firmware/tree/master/keyboards/projectkb/alice

It's weird that it has worked in rare occasions without, but know it works flawless.