Why does electricity disappear and appear in the summer kitchen?

Hello, help with advice, I'll start from the beginning. We bought a private house in another city, before there were no problems with electricity, but recently arose. The fact is that in addition to the house in the courtyard there is another room (summer kitchen). Recently I came home from work and went to feed the dog, but there is no light near this kitchen, I checked it and it turned out that it wasn’t anywhere, so to speak in that wing. I explain that there is a separate wire from the meter that feeds this very kitchen, capturing a room with a basement on the way and there was no electricity everywhere, only the light was on in the house. It was already dark to watch something, I decided to leave it for later so to speak, and when I went to check again in the morning, then there was already electricity everywhere (in the kitchen and in the basement, everywhere where it disappeared in the evening). So the question arose, for what reason could it be and how to identify the cause? Now it’s burning everywhere, but I’m afraid, it suddenly closes somewhere, I hope you advise something. I also forgot to add, the wire going to those rooms is aluminum, not old. Visually, when I did the wiring, I can’t say, because there are no contacts with previous residents.