Sorry, but have you checked your btrfs volume hasn't run out of unallocated space? I've been slowly studying the workings of btrfs filesystem here: https://together.jolla.com/question/...ious-problems/ Some of the symptoms align with mine before finding out that there is more to btrfs than meets the eye. In short 'btrfs fi show' command will tell you if you have any raw space left. If not, it may be the cause of the problems. Running balance operation resolves this (if you are still able to do it). It is not enough just to do factory reset and update again. The initial problem persists through factory resets, as it is just a btrfs snapshot and not a disk image.