Why does my straightener stop working when in a new powerpoint?

i have a cloud 9 straightener that has lasted about two years. when plugged in in my bedroom, the straightener works perfectly and has no problems whatsoever. however, whenever it is plugged into an unfamiliar powerpoint, it stops working entirely. it has happened twice before and has been fixed by a hard hit from a hand. i have tried this once more without success. there is no reason for it to have blown up, and it is becoming more and more irritating.