First a little bit of information about my system:
OS: Ubuntu 18.04 with encryption while installing
DE: i3wm (probably doesn't have to with this, because the same problem appears in Gnome)
Hardware: Lenovo T470
Since about three days I'm encountering the problem, that all of a sudden the CPU usage rises to about 100% (sometimes 98%). Shortly after the rise nothing works anymore and bash returns an "Input/Output error" and I have to power off by removing the battery...
Now I know Input/Output errors usually happen because the hard drive is full, but mine isn't even remotely full (at about 7% - checked with df).
Here is the output of journalctl of the last two boots: Journal
I don't understand what's going on and I already had to repeat some work because of this, so any help is appreciated.
