Thank you for your advice, @anon9989719.
I opened my phone only four months ago and took the opportunity to clean all the contacts. However, the phone is “very fussy” about when and how to charge (no charging, slow charging, normal charging… for a week now it never charges fast), even with different chargers and cables.
As @Joao says, I’m afraid of damaging it more if I open the bottom module… I would feel more comfortable changing everything.
In any case, it frustrates me to have so many problems with this port. I hope it gets fixed soon.
Thanks again!