Clocks mainly...in my home and the clock in my car actually (and I have a new battery).
Yesterday - the clock/timer on my microwave went blank. It's a year old and the display was on and 5 minutes later went blank as I was standing there.

Could be nothing but I just unplugged it and plugged it back in and back in business. It was just strange because the microwave still worked just the display went blank for no apparent reason.

🤷‍♀️