Your home has a wide range of electrical components, conductors, electrical connectors, circuit breakers, controls, relays and sockets. All of these elements have various types of electrical connections: terminal, sliding, interlocking, fast-on, etc. The prolonged use of the electrical services of all these components can lead to deteriorated contacts which can then lead to malfunctioning. Most electrical controls are usually in boxes which can also be affected by various types of humidity and are therefore exposed to oxidation, dust and rusting.
Whenever you have an electrical problem, before calling an electrician you should make sure that the problem isn’t caused by contacts interrupting the service. Always be sure to turn off the power from the mains by disconnecting the main switch and turning off the meter. Please note that non-professionals are not authorised to carry out certain interventions except in emergencies, as they must be done by an authorised technician.