Electric safety code in Taiwan?

My sister is in Taipei taking care of my elderly mom. Every night she refills the electric thermos so Mom would have hot water ready in the morning.

I usually have a conversation with her daily before she gets to bed.

We spoke a little while ago (it’s past midnight there). She casually mentioned her electric thermos — she refills it each night so Mom has fresh hot water in the morning. Tonight she saw something floating inside, so she unplugged it and discarded the water. After refilling and plugging it back in, the thermos didn’t light up. She said that sometimes appliances in Taiwan behave that way (their microwave did the same) and it usually comes back on later.

We bought the thermos just two years ago when the old thermos broke down while I was visiting. Is that a thing in Taiwan to wait before re-plugging thermos and microwave ovens? Maybe it ihas something to do with Taiwan electric safety code? They’re staying in a rented a unit in an older apartment building in Taipei with elevators.