I'm currently enduring that now. Unfortunately, I cannot just quit. I and my child have very expensive healthcare needs now and I need to be picky about the healthcare offerings. It's a very slow search because I'm at the top of what I can reasonably expect for what I can give. I can take jobs with more responsibility and excel, but at the cost of my child's health, so that's out. I won't trade pay for her care. I've looked at dozens of insurance plans from perspective employers and reminded myself why I took such a dull job. I'd take a significant pay cut to move anywhere else just from medical bills.
So, I sit at this job bored and apathetic. It's a slow march to burn out. From an outside view it doesn't make any sense to take a new job. This is the trap many of my friends fall into. But burnout isn't always about if a job is hard. It's mostly about how it makes you feel emotionally which will trickle down to physically eventually.