*Your pots maybe slow enough....
*The Enemy have FULL gear UBER + complete sets of uber accesories
*Your enemy have buffs From elf or DL (just Look at them closely)
*In some cases they are using hack.
*Maybe you are too lag in game... it will affect your potting...
*Maybe your set is not full DDi 7%
Maybe one these are the reasons why you died fast..
try to search here forum for some more advice by other players..
Thanks,
.MushrooM.