I was trying to save https://fi.wikipedia.org/wiki/Miesten_kaksinpeli_Yhdysvaltain_avoimessa_tennisturnauksessa_2013, but when I clicked "save changes" and waited about one minute, came "Edit conflict: Miesten kaksinpeli Yhdysvaltain avoimessa tennisturnauksessa 2013" and changes were not saved when I looked at the history.
There was also text: "Someone else has changed this page since you started editing it", but it's not true. Nobody else were not edited the page lately. When I tried to save the page again it saved normally without any problems. I think that problem comes because the page is so long, but this should be fixed in some way.