Edit: Some answers and comments have made it clear that in choosing not to elaborate very much on my issues with management, I may have poorly described the breadth of the issue. What makes me choose the word "disrespect" is that the unresponsiveness of my management has caused my work life to clash with my personal life. I cannot contact them when I'm sick and need to stay home, or just when I want to request some vacation time. Most recently, I have been unable to reach them when I needed to care for a loved one recovering from surgery. I had to go to work because I couldn't get any approvals to stay home. I have also been encouraged by them to violate company policy by coming to the office with possible covid symptoms.
Early this year I accepted a promotion-in-place at my place of employment. For reference, this is a very large company. I had been with the company for about a year and a half already. I negotiated a higher than average salary for my new title, and agreed with my management that I would remain with the company for at least another full year after accepting the offer. I am not contractually bound to do this, but it is standard etiquette.
However, I no longer feel as respected by the company as I once did. There have been changes in management that have resulted in less flexibility for me than there was when I accepted the offer. It has become difficult for me to contact some of my management team, and I am usually left without a response when I need to ask a question or make a request.
But perhaps my biggest complaint is that the IT department at my company is extremely difficult to work with. They take months to respond to requests that are blocking productivity. Even when they do respond, they often do not properly understand the request, do something incorrectly, and they must be asked again. They also regularly take a year or longer to deliver new computers. And they come through once or twice a month to repossess assets they believe are unused, sometimes going behind my back to steal a machine I have explicitly told them we need to keep. I could list more grievances with them, but you get the point. I recognize my management is not at fault for this, but it does make my colleagues and I all feel like we are not valued by the company.
Is it appropriate for me to leave this position even though only about 6 months have passed since I agreed to stay for another year?