Is there something wrong with my Sony Bravia tv?

I have a sony bravia hd lcd tv. Occasionally when we turn it off and a few minutes later turn it back on it takes like a minute to actually turn back on...I bought it from rent-a-center about six months ago. Again it only does it every once in a while but i do not know alot about electonics at all...I may be over reacting but i paid alot for this tv so i want to make sure if there is an issue it gets resolved. is there something wrong with my tv or is this just normal??