Dock connector not always work after replacement

Hi,

Few weeks ago my dock connector wasn't working at all. I ordered a new one and changed it with success.

It worked properly for few weeks.

Now since a few days, it starts not working properly (loading and synchronisation). I tried several cables and same issues.

I noticed that when I fold the plug of the cable towards the up, it starts working again.

I've unmounted and tried to find if anything inside was misconnected but couldn't find anything.

Any idea ?

Thanks for your help!