WOW! This is exactly what has happened to me at my current employer. The working conditions slowly got worse over time and I didn't notice it. Finally I work up and I was like wow. I went from being occasionally called every once in a blue moon to being called every single weekend to help someone do something. I haven't had a weekend off since the weekend of my wedding in January, I can't remember before that how long it had been to have a weekend devoid of work calling me for some reason. Even then I had to put out three emails before my wedding saying I was unavailable that weekend. I am putting in long hours but I fall behind because they refuse to address key issues. So I have put my resume out.