Reviving this old guide.
If you have questions about this or want to suggest issues to be included please do so here.
Most issues can be found on Fairphone's official Troubleshooting Tool.I based the list below on that tool and put all issues that are covered with the tool in bold. In those cases the added links to forum topics are usually mainly for you to know where to post if you want to discuss that issue. If I put the link to the forum topic in bold it means it contains additional info not covered in the troubleshooting tool (usually in the first post or a post marked as solution). If I put a in front of the forum link it means the guide in the forum is more extensive that what the troubleshooting tool or any support article covers.