Charge problems since I bought a Samsung external Battery

In 2 years of intensive usage, I had never had any problems with this phone using 1A or 2A chargers or batteries. I would even say that it worked perfectly.

I started having problems when I bought the samsung quick charge battery (mentioned above).
I now have a few weeks of hindsight and here is what I did and tested.

I tested several chargers, as well as several cables.
Some cables work better than others, but I think it’s a matter of connector design.
So I extracted the bottom module, I cleaned the internal usb connector, and I tightened it with pliers (be careful if you do that, it’s very fragile). The result is that all the cables are working and the detection of the charger is good.

Then I hadn’t noticed before, but when I plug the phone in, it often goes into slow charging mode (and rarely in normal charging mode).
And when I plug on the quick charge battery, it often goes to slow or normal charging mode (and rarely in fast charging mode).

Sometimes I put the phone to charge, and the yellow light on top turns on, but the phone does not charge.
And sometimes I put the phone to charge, the charging mode starts, and when I come back to check a few minutes later, the phone no longer charges even though I haven’t touched it and the cable is still plugged in (no charge information on unlock screen, and no lightning logo on the battery icon).
Unplugging and reconnecting the cable causes the charge to restart in these cases.

Searching the forum I find a lot of people having slow charging problems, and I think it’s related. Using this quick charge battery triggered this problem in my phone in slow/normal/quick switch charge.

I do not know if it is an hardware of software issue. Do the slow/normal/fast charging mode a software or a hardware switch? Where is it placed? On which module?

My phone is no longer under warranty and I wanted to change the bottom module to see but they are out of stock everywhere.

Do you have any suggestions to help me fixing my issue?

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