So I'm in the middle of my 5 day subbing assignment. For the most part things are going good with the exception of a few girls who think they can challenge authority and get their way. Anyway--I had a 3 day Math assignment (on two separate tickets) for the same teacher lined up for next Wed-Friday. And today the automated system call me and notified my job was canceled. Is this common? What did I do wrong? I feel like I'm having an anxiety attack over this.