I own a FP2 since more than one year and I was quite happy with it.
During this year the phone has gone through a process of stock->root->encrypt->decrypt->marshmallow update. I really like to mess with my hardware.
That is probably the reason I am writing this.
Since the marshmallow update (which I had to flash manually), most of the software has not been working properly (particularly gapps). Since one week ago, the phone was barely charging any battery when I plugged it in, and it often bootloop.
I then wiped the phone to factory reset from TWR and the phone seem to respond well to that. But next thing I know is the battery does not charge anymore when I plug the phone.
The current situation is just a bootloop of the Fairphone logo every 10 seconds whenever I try to charge it (I don’t even get to optimizing app…). No chance of accesing TWR anymore either.