Western Digital My Passport Essential 250gb frozen when put files on it

My WD 250gb seem to work find but when I only have 80gb or less on it  I can’t seem to put anyfiles on it at all if I do It will just frozen the computer unless I unplug the usb any help on it?

Even when I use WD FAT32 Formatter it still the same it work fine then when it get to 80gb or less it just said write delay failed and forzen my computer then I have to unpulg the usb any help would be nice.