right bit of a weird one for you gurus out there

got a mk1 focus 2.0 ghia with 4 electric windows all 4 used to work fine and all have "one shot" up and down but ive noticed these last few days that the front two dont do the "one shot" up... they do do the "one shot " down however

back ones are fine



anyone have a clue as to what it is?????????????????



TIA