I'm running CyanogenMod 7.1.0 on my HTC Desire. I have a few accounts added in "Accounts & Sync" (Last.fm, Facebook, Skype, Soundcloud, etc.), but on several occasions all of them (except Google) got deleted, and I had to log in again in all of them using the respective applications. This could be quite annoying, but fortunately happens only every few days or so.
I can't quite understand why it happens and what causes it. I have some suspicion it might be related to the fact I don't have much space on the device (Desire notoriously has ridiculously little internal storage) -- although I always keep it above the "Low space" warning (which is something like 15 MB).
Is this a known problem? What can I do to prevent it?