Do you use a public transport card (called a Go card in my city)? Have any credit card or building entry pass with embedded electronics?
Beware of physical damage to this card. I recently noticed a tiny hairline crack on my public transport card and ignored it. Not a good move. It suddenly stopped working and I had to replace it urgently as I was about to travel on public transport again. All is well that ends well but it would have been much easier if I had done the replacement in a planned manner before the catastrophic failure. Check your cards or a sad story might ensue. (Photo is of a children’s story game)