My 2 years old RN3 charging port issue started 2 weeks ago. It stopped charging randomly because the connection is loose.

I've clean out the lint from the microUSB port using a sharpened toothpick. It looked clear now.

Temporary solution: I changed to a BRAND NEW & ORIGINAL RN3 charger and USB cable and the connection is much better. As long as I don't touch the phone, it'll charge as normal.

But when I use any old usb cable (loose), it will charge very slowly and disconnected even though I DON'T touch the phone at all. Have to try different positions to make the connection last.

Don't dare to change charging port myself. What else can I do?