Just as a general information:
I thought that I will also have a broken USB connector, bacause I was only able to charge the phone with the original loader properly (1Amp = 5Watts), if I try to use certain cable positions.
But I tried a cleaning of the connector (both, of the FP and of the cable) without opening the FP.
And it seems to help (not yet 100% satisfied, but it was a first try). It is at least ways better!!
I used an (old) electrical tooth brush (not wet!!) to reach all visible parts of the connector.
I also just thought about to use some kind of alcohol or special connector-cleaning liquid, but didn’t try this yet, because I want to avoid any demage to the materials and have to think about what to use. (I think Isopropanol should be working…)
So all people bothering with charging problems should also first check for a dusty connector!
Plus: I did not notice any “movement” of the USB connector, thus it is most likely in deed not broken.