davefromworcester

hi all, got a problem with my galaxy 2.3 (2001) y reg one morning in the cold i started my car and de-iced the car and my front wipers justed stopped working for about 3 mins,then they worked only on fast speed,slow speed would hardly move,the wiper would shake as they moved then would stop,but if i put it on fast it would work for about 20 then slow down and stop but would come back on after a 5 min break,i took it to the garage and they checked the wiper motor and all was fine so they put grease on somethink and all was well for about a week, then back to the same problems,has anybody got any clues as what is going on many thanks to you all