Why did the power outages disappear?

Good afternoon! Such situation. Yesterday, the voltage disappeared in two outlets in the kitchen. There was light. One socket is powered from the room (copper). The second outlet was powered through the terminal block from the kitchen distribution box (aluminum with copper). The puncher and grinder worked all day. A boiler was included in one outlet, in a second refrigerator. All was good. They finished working and somewhere in 3-3.5 hours they turned on the screwdriver. On the fourth batch, the sockets stopped working. This morning they are working again. What could be the reason? So that this does not happen again.