Salary pay, bonuses, and holiday pay

What is the law in WA concerning salary? I am paid based on a 40 hr. week salary. I work 50 to 60 hrs. per week. It has happened on a couple occasions where I took an extra day off and was only paid for 4 days (32 hrs) even though I worked 36 hrs. I had to use 8 hrs. vacation pay to receive a full paycheck. We are also on a quarterly bonus program. We have not received 4 out of the last 5 bonuses. And finally, when I took the salary position, I received holiday pay for 6 holidays per year, above my regular 40 hr. per week salary. After the first year, the boss claimed it was a mistake and stopped paying holiday pay to all salary employees without any notice. I am so frustrated. I love my job, but feel the boss is screwing all of us salary people. - Is this your question? Add additional information