Get someone to check it out. Electrical fires are dangerous.

A friend of mine had faux tiles put on the wall above his kitchen counter, but the sockets weren’t moved out to the new surface, but kept recessed. The cover was put back on.

Now he got arcing between one of the phases and ground on the inside of the cover due to the small gap that was created.

For him it triggered the RCD. In an old house you might not be so lucky.

To put it this way, I’ve never noticed Ozone smell from a properly working socket.