You've done a great job modding the past year and a half (?); sometimes you need time for yourself or other things. I still love my team but I agree something seems to have happened during the second half of this last phase. Maybe it will get better next phase, but there's no reason for you to do something you're not enjoying anymore. You'd be missed, that's for sure, but it's understandable if you needed to step down or quit altogether.