C5 downshift doesn't work

Hi everyone,

early this year I bought a Cammus C5 bundle second hand and till yesterday I had a lot of fun with it.
I was playing LMU and all of the sudden the downshift paddle didn’t work anymore.

I checked if the pedal itself broke (because many people gave problem with the durability of these pedals), but it has no signs of cracks or other signs of use.
Then I thought restarting it would maybe help and it did shift down, but only once, then it stopped working again. I reinstalled the Cammus software, to see if setting it up would help, but this didn’t help.

At this time I had the feeling it might be a lose contact or a problem with the connector for the left shift pedal, so looked up some tutorial to open the wheel, which was not that hard.
I disconnected and reconnected the connection of the left shift pedal and it did work a few times, but after a short time it stopped working again.

Did someone else had or have this problem and is it easy to fix?
Is ist possible to get a replacement connector for the left shift pedal?

I hope someone can help me with this problem.

Best
Flo