I've noticed myself holding my breathe and forgetting to breathe?

Over the past few months, i've noticed myself holding my breath or forgetting to breath, but not on purpose. I've read that it can be an anxiety thing, and I understand that, but I'm never really anxious when it happens. When i'm upset, angry, nervous, etc. I know I hold my breath, that's intentional. But when it happens now, I could be doing something as simple as typing, washing the dishes, or laying in bed. I just wanted to know if theres a real reason for this. It's honestly more annoying than it is anything else. I just wanted some answers. Any ways, let me know if anyone knows something! Thanks!