The electric distribution board of our apartment looks approximately like this.
It has one main switch and 5 sub-switches. Every several hours, the main switch randomly 'jumps' and our entire apartment is disconnected.
We thought one of our devices might be the cause, so we disconnected almost all devices except the refrigerator and the freezer, but it still jumps randomly. We don't want to disconnect the refrigerator and freezer, because since the 'jump' occurs randomly, we do not know how much time we will have to keep them powered off.
We still don't know if it's one of the devices, or maybe there is another problem. How can we find out?