System suddenly suspends without warning


I’m suddebly having a lot of trouble where my system will suddenly start suspending itself without warning. I will have to wake it up only to suspend itself after a minute or so. It will sometimes not even wait for me to unlock, making the system unusable. It seems to be irrespective of kernel. I am running an Acer ConceptD 3 Ezel with KDE.

Maybe there is an option to suspend after X min of idle? At least on Gnome there is one.