I experienced a similar problem. My fairphone stopped charging 4 weeks ago. After 3 weeks support send me a new batterie, but it did not help. The phone still does not charge. So right now I am in my 4th week without phone and I am starting to be really annoyed. I told support several times that this is my only phone, business and private, and that I need it working quickly. But they seem to have all the time in the world. The last response was 5 days ago. I was told to sign up at the return portal to have my phone sent in. So I did that and still nothing. In the procedure I was told to make a backup, because they will wipe everything. I was asking how I am supposed to do that if the phone is not working at all? No answer…
This is my first very bad experience with the phone. Of course there are small issues like cracked cases, a bad camera,… but at least the phone was working. I can live with this, it is normal for the small production number. And so far the support was very helpful and rather quick. The problem is, now that I have a SERIOUS issue and can not use the phone at all, I feel left alone. 4 weeks without a phone and responses once per week is not ok in my opinion.
All I want is a new bottom module to test if it is broken, since this seems to be the case for other users.
Now I have bought a cheap external charger to be at least able to make the backup. A useless piece of electronics I buy for a one-time use. I thought that this company wanted to avoid exactly this! But maybe I have to use it for a longer time if I have to continue waiting for a normal guarantee repair…