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Look at your charging port closely with a flashlight and a magnifying glass. I have seen some - usually on phones that are kept in a pocket - so full of lint and grunge that the charger could not make a good connection. This even happened to my phone personally.
If your charging port is grunged, you can clean it out with a sharp toothpick. The plastic ones are generally thinner than the wooden ones. If that's still too big to get in there, you could use a very small straight pin or needle. Yes, you really shouldn't be sticking metal down in there with the contacts, but you are probably not going to do any damage because it is a power input, not a power output. What are you going to do instead? You have to clean it out somehow. Maybe you could break off a plastic bristle from a toothbrush or a paint brush to use as your cleaning tool. Think creatively!
p.s. - In the case of my phone, the lint in my port was not covering the actual charging contacts. It was packed down at the bottom of the socket, which prevented the charger plug from inserting fully to make a strong connection to those contacts. The only symptom there was a problem was that the charger cord did not seem to plug in as securely as it had in the past. But it still felt mostly secure, and the problem crept up so slowly that I didn't notice an abrupt change in how secure the charger plug felt. So I must have gotten used to that slightly unsecure feel as I plugged it in every night. But after cleaning out the charger port, it was very obvious, "Oh, this charger cord plugs in much more firmly now!"
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