Breaking Flex plates

I preciate all the help....I think I a decent mechanic but I don't know everything so gotta ask u kno.....I KNOW it's better to have hands on but I tryin to gather ideas so when I get stateside to work on the car I have a start....My other question about alignment is this engine and trans been 2gether for about 6 years without a hiccup until the past year or so, can it still get outta alignment? If so how? Trans has neva been out prior to the first one breaking and that was the one the builder put one. The second an the one on it currently is the parts store brand.