Tampa Florida Home, New construction, tile hairline cracks

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This post is actually about my personal residence. 

Our house was built almost 18 months ago and we're starting to notice hairline cracks on our tile flooring. Our builder warranty expired about six months ago and we already have about 4-5 tiles with these cracks. Some are pretty recent. 

I'm curious if this is because of improper install, just settlement or cheap tile. We paid a pretty penny to get this tile installed and every time I find a new hairline crack I'm loosing hair from my head. Is this normal and I'm just stressing for nothing or should I start nagging the builder about this matter ?