As the thread title says, for some bizarre reason, KMail keeps on periodically annihilating all of my mail folders, and all emails in them ─ read or unread. I have to painstakingly recreate the folders all over again and set them up one by one with the appropriate options. I happens every time I manually check for email, or when I restart it (because it has gone offline for no reason), and at times it'll also do that all by itself when a new email arrives.
I have seen this happen before once or twice in other distributions, but never this bad. It happens almost every day. It will also periodically take itself offline for no reason ─ which means that I'm not receiving any new emails anymore, even though my computer is running 24/7 and I have KMail open all the time ─ and it also has a mind of its own when you try manually ordering the mail folders. It even goes so far in this that it decides to rename the folders back to their earlier name if you had renamed them in the meantime.
This is really bizarre. I'm thinking about taking my computer to an exorcist