You could have major structural issues with your stucco. Stucco is not
waterproof and as water gets behind it must have an avenue of escape
(drainage). This has become a bigger and bigger problem in the past 10
or 15 years as homes have become more efficient and sealed tighter with
house wraps etc. Water used to dry to the inside of older homes but on
new homes it can't. As a result it will destroy stucco.

Start at this website to get the basics of stucco problems / solutions.
Good Luck

www.badstucco.com