Got a promotion and had a loose definition of what my new tasks were. I got overwhelmed with being the go-to for project and account managers, and 75% of our devs, on top of my own work I had to complete for clients.
Eventually I wrote up a 2 page document of things I had to deal with daily/weekly and how I don't have time to do my work, so why should I even bother to do it.
We got it resolved, my boss took some of the tasks off my plate (like training the new hires) and allows me to work from home whenever I need to finish up work.