Constant stress, doing the work of 2 or 3 people for a couple years. Everyone complains about how awful it is (during and after work) and when assigning work to people I was accused of targeting them and a lot of times people asked me to assign them less. It was just too much work split up between the amount of people we had.
Some days it felt like if we weren't able to get an impossible task done someone would die. They're just cell phones and back up routers, honestly.
I asked for another raise in my 5th year there. I had taken on a lot of supervisor responsibilities and felt I was worth it. I was told I couldn't get another one because I was already a team lead 2 and there was no level higher than that.
I asked if we could get another supervisor position opened for our team, because I would go for it. The team had tripled in size and there was still only one sup. The second sup position was never opened and I never got promoted. I was told not to feel stuck, that there were other places in the company I could go... Truth is I liked mobility except for a lot of the upper management changes and stress on us. I quit and then once I was no longer there to do the work of 2-3 people a supervisor position was opened and filled.