Disk space became full again last night. I enabled logging on file though.
I am going to check what actually happened. But for now I think that this happens when the computer fails to download an image from my QHY165C, i.e. it is stuck in "capturing an exposure". This problem occurs rather frequently on Ubuntu 18.04 and macOS with INDI.
I should also mention that a similar problem with my camera exists on Windows (SGP), but instead of being stuck at exposure it is stuck while downloading the image.
So which disk ran full? / or /home? (or are those on the same disk?)
Is it the kstars/ekos log file that is huge, or is it (hardware device) errors from the kernel?
You said you're going to disable logs. Did you? seems not...
Rendering Error in layout Message/Item: array_keys(): Argument #1 ($array) must be of type array, null given. Please enable debug mode for more information.