As others have already said, the durability of Eggbeaters--bearings specifically--is quite limited.
While I run and enjoy Eggbeaters, the key for me is to treat them like a disposable item. Sad but true. I've not had good luck with the bearing replacement kits. I find that replaced bearings last even less time than the originals. I've come the conclusion, thus, that futzing with the replacements is not worth the time/cost trade-off. When your current pair dies, buy a new set of 3s and just slap them on the Ti spindles from the 11.