Profitec Pro 600 flow control issue

[Yoyodinde]

Hi community,

First post for me, I was dreaming of the pro 600 with flow control as I wanted to be able to play with different coffee beans and profile...

Last week I received it and I was so excited...
Realising something was wrong.
The flow control would constantly drift it's closed positions to the right.

After opening the flow control, trying to understand what's going on I found a debris inside, took it out and put back to FC in place.

Unfortunately since that. The flow control doesn't work anymore. It goes from closed to full flow with just a tiny movement to the right...

If you have any idea of what could cause that?
So annoying to have issues from day one :/

Thanks for your help