freezing problems?

I have a r4-sdhc upgrade, Ive downloaded the latest kernal from www.r4i-sdhc.com. When i load games for the first time it freezes on the save file screen for ages if I leave it it will go through, I then turn off ds and go into same game and it freezes on the loading screen and again I leave it for a few minutes and it goes throughto game screen. Any idea guys?

On the downloads page, take a good look at the images to see if the left of right kernal is for your cardThe left one suports both cards by the look, but the right image just look like it ownly suports R4i upgrade

yeah i downloaded the correct one. It says r4-sdhc fire card pls download bellow kernal, which i don't understand. mine is not the 1.4v card.

All firmwares for evey card can be found hear - (note) this page takes a few moments to loadhttp://www.linfoxdomain.com/nintendo/ds/