Wondered if anyone can help please!

I have noticed this morning that my heated mirrors are not working also the adjustment of the mirrors do not work either is this a fuse issue or can it be something else 

Have you accidentally rotated the mirror switch to the OFF position. There's separate positions for 'L' , 'R' adjustment, 'heated' and Off

No definitely in the right position but for some reason it’s working again unless a switch was stuck or maybe because I was driving at the time it doesn’t work not sure? But main thing it’s working again 

cheers for the response