Teacher Retention and the Retention of New Teachers

A few weeks ago our school had two teachers quit with only one week's notice.  One was from the department that I support.  This happened to me last year as well right before the end of first semester.  It baffles me how some teachers think that this is corporate America and that they can just give a two weeks notice (if that) and not give one care in the world.  This directly affects the students as well as every other teacher in the department.  We had to have 4 teachers and myself the AP go on extended day for two weeks before we found someone.  Although I enjoyed being back in the classroom teaching one period each day, it was beyond stressful to find someone remotely qualified to teach the kids.  What worries me is that many of our veteran teachers are suffering burn out and we are not even done with first semester and we have brand new teachers to the profession who just up and quit and think it's okay not to push through and finish out the year.  We are a Title I school with somewhat challenging students so our teachers bust their tails every day to may learning engaging and personal for each student.  Our teachers are consistently going to trainings done in house by highly qualified teachers who specialize in certain areas.  They work day in and day out and it's driving our very strong teachers out of our school as well as out of the profession.  For me, I lost eight teachers last year in my department for various reasons and this was just my first year as an AP at this school.  I at first thought it was me, but they assured me it was other reasons which I will not mention.  We are trying very hard to change the culture and climate but we are struggling right now.  I know that I cannot do another year of hiring eight new teachers.  I worked from February through June trying to find the most qualified teachers.  I will say this year has been awesome with the teachers I have hired as well as keeping our veteran teachers positive.  It truly has been a change for the best.  But I do not want any of my teachers leaving because we have finally found ourselves in a very upbeat and positive climate within my department.  But my teachers still are burnt out no matter how positive they appear.