washing machine hotpoint wmd940?

hi, my problem is that when i put it on a wash for 40%.
it said on the front of it that the cycle lasts for 46 min. but when it gets to one min it just goes on. and when i stop it and put it on fast spin, that lasts for 16 min.
it does not spin fast. and when it gets to about 5 min to go it stops and flashes f11. and when i press the stop button it wont stop. about 10 min later it stops on it's own. what should i do?

joy allaker
January 2013