I have had a strange issue only starting last week.
Occasionally when I put my S20 Ultra charger in, it does not detect the cable / do anything at all. In order to resolve this, I need to put the cable in upside down (the other way round?). Once I do this, it then charges, and then allows me to put the cable the way it was before, but then the next day it will happen again.
It is not the worst issue as the phone is fully functional still, but I am very warey of bad charging ports due to having to put up with it on the S9 for around 18 months, so any kind of charging issue is annoying to me.
Does anyone know why this could be happening?