I have three monitors. When I lock my screen and leave my machine for long enough my two secondary monitors like to swap with each other (swap desktop backgrounds and panels). I suspect that this occurs when I lock my screen and leave for long enough that the monitors sleep. Rebooting my system results in the monitors remaining in the same configuration they were last (swapped or not).
I’ve no idea what logs I should provide with this so please point me in the right direction, cheers.