My cake sunked in the center? why? what am i doing wrong? baked 2 times great then baking 2 more times and disaster!! is my oven to low or needs to be higher?

What temp are you baking at?
Are you using a mix or scratch recipe?
We need more information to help you.

my recipe is this

tres leches cake

2 cups flour (all-purpose)
2 cups sugar
5 eggs, seperate
2 Tbs. baking powder
pinch salt
1 tbs. vanilla

in a preheated oven to 350F+

trini333, there's no fat or liquid in your recipe - is this correct?

Are you mixing everything at the same time using the one bowl method?

Handy cake troubleshooting charts:

http://tinyurl.com/2p5bdu

http://tinyurl.com/6c745g

http://tinyurl.com/32goqe

HTH